| Table of Contents | |
| Possible Causes of P0175 & Their Repair Costs | Code P0175 signals that Engine Bank 2 is running too rich due to too much fuel or insufficient air entering the combustion chamber. |
| How to Diagnose the Cause of Your P0175 Code | P0175 codes can be caused by problems with mass air flow (MAF) sensors, vacuum lines, oxygen sensors, fuel injectors, and fuel pressure regulators. |
| Can I drive with a P0175 code? | Short-term driving with a P0175 code is acceptable, but long-term use without repairs risks damage and safety concerns. |
| DIY | How To Fix P0175 Causes |
DIYable P0175 triggers include:
|
| P0175 Code FAQs |
Frequently asked questions:
|
Coming across a check engine light caused by code P0175: System Too Rich (Bank 2) is a problem of too much or too little. Specifically, the engine’s Bank 2 is receiving an excess amount of fuel or not enough oxygen. This matters because most vehicles need 14.7 parts of oxygen for every 1 part of fuel. An imbalance in this mixture can set off various issues ranging from reduced fuel economy to engine stalling. More severe cases can involve damage to the engine or catalytic converter if the problem is ignored.
A P0175 code appears when an oxygen sensor signals the engine control module (ECM) or powertrain control module (PCM) that the normal air-to-fuel ratio is incorrect. This makes diagnosis straightforward since mechanics can immediately focus on parts that feed that specific bank, like oxygen sensors and fuel injectors. Of course, you’ll sometimes need to check parts that affect the whole engine, too, like the mass air flow sensor or fuel pump.
The way Bank 2 is set up depends on the engine type. In V6s and V8s, Bank 2 typically includes the even-numbered cylinders, though Ford does things differently with sequential numbering. Even inline engines split into banks, with Bank 2 being the second set of cylinders. Subaru and Porsche boxer engine bank setups follow V-engines’ basic layout.
In addition to code P0175, there is a series of P017X codes involving the fuel system. These include:
- P0170: Fuel Trim Malfunction (Bank 1) (insufficient fuel to the engine)
- P0171: System Too Lean (Bank 1)
- P0172: System Too Rich (Bank 1) (similar to P0175)
- P0173: Fuel Trim Malfunction (Bank 2)
- P0174: System Too Lean (Bank 2)
Code P0175 can be considered a moderately severe DTC. Driving with this problem for a week or so generally won’t make things worse, but repairs shouldn’t be delayed. That said, a drop in engine performance, such as hesitating or stalling, becomes a do-not-drive situation due to pote s, and the most vulnerable vehicles for these problems.
Possible Causes of P0175 & Their Repair Costs
In a worst-case scenario, P0175-related repairs run $1,000 to $1,200, but the work can cost as little as $100, even less with a DIY approach.
Check out the FIXD article on the most common causes of check engine lights.
Here’s a look at the parts most likely involved with a P0301 code and how much things cost. Note that actual prices depend on the vehicle and location.
P0175 Code Triggers & Typical Repair Costs
| Part To Repair | Part / DIY Price | Mechanic Total Cost |
| Vacuum Line | $50–$100 | $200–$300 |
| Mass Air Flow (MAF) Sensor: Clean | $20–$40 | $100–$200 |
| Mass Air Flow (MAF) Sensor: Replace | $40–$50 | $239–$346 |
| Exhaust: Repair Leak (welding) | N/A | $100–$200 |
| Fuel Filter | $87–$100 | $175–$211 |
| Fuel Pressure Regulator | $165–$195 | $266–$322 |
| Oxygen Sensor | $300–$333 | $362–$412 |
| Fuel Injector | $450–$541 | $644–$784 |
| Fuel Pump | $923–$1,056 | $1,089–$1,266 |
Let’s examine how different components can cause a code P0175.
Parts Most Likely to Fail & Cause a P0175 Code
| Parts that can cause P0175 | How it could cause P0175 |
|
Vacuum Line MAF Sensor Exhaust Oxygen Sensor |
The engine control module/powertrain control module receives incorrect sensor data, or the introduction of excess air creates a fuel mixture that is too rich. |
|
Fuel Filter Fuel Pressure Regulator Fuel Injector Fuel Pump |
A fault anywhere in the fuel system can introduce too much fuel into the combustion cycle, creating a too-rich air-to-fuel ratio. |
Makes Commonly Affected By P0175
FIXD sensor data reveals several interesting details about P0175 codes. Curiously, among the most affected models (see the table below), only 20% are traditional passenger cars (the Nissan Altima, Nissan Maxima, and Ford Taurus). The rest are SUVs, pickups, and minivans. This isn’t to say that driving an ordinary car lessens the chance of getting a P0175 code, but the contrast is notable. Further, this data covers vehicles as far back as the 2000 model year, long before sedans started falling out of favor.
Chevrolets are most affected by P0175 codes among all automakers, with the Silverado 1500 at the top of the list. The venerable Suburban and the Silverado-based Avalanche truck join this pickup truck. All three vehicles share the same platforms.
The Altima and Maxima get the top spots for Nissans with P0175 codes, while the long-serving Frontier pickup slides into third. Like Chevy, Ford’s best-selling pickup, the F-150, sits atop the code P0175 rankings. Another Ford truck, the Ranger, sits in second place. The Taurus, which last sold new in 2019, completes the top entries for the Blue Oval.
Toyota also has a strong history of P0175 codes, with the Tundra being the most impacted. The Sequoia SUV, which shares many components with the Tundra, unsurprisingly takes second place for the automaker. The Sienna minivan completes the podium.
With Chevy’s status confirmed as the worst offender for P0175 codes, no one will be amazed that its corporate cousin, GMC, is similarly plagued. The Sierra gets the top dishonors, with the Yukon and Terrain in tow.
| Top 5 Makes Affected by P0301 | Most Affected Model(s) |
Chevrolet |
Silverado 1500 |
| Suburban | |
| Avalanche | |
| Nissan |
Altima |
| Maxima | |
| Frontier | |
Ford |
F-150 |
| Ranger | |
| Taurus | |
Toyota |
Tundra |
| Sequoia | |
| Sienna | |
GMC |
Sierra |
| Yukon | |
| Terrain |
How to Diagnose the Cause of Your P0175 Code
Discovering the reason behind a check engine light requires an OBD-II scanner. Your options include the FIXD plug-in sensor and accompanying app that shows the diagnostic trouble code and common causes behind the problem. Alternatively, a basic code reader that plugs into your car’s OBD-II port will also work, but these devices only show the code, not the underlying issue that triggered the code.
For a P0175 code, there’s not much for an amateur mechanic to investigate (problems like a faulty oxygen sensor or catalytic converter are best left to a professional). Nonetheless, if you decide to explore under the hood or elsewhere, there are a few essential safety steps to follow:
- Have the right tools for a basic inspection: a flashlight, gloves, safety goggles, and a rag. Hand tools may be necessary for more detailed work.
- Park on a safe, level surface.
- Turn the car off and engage the parking brake.
- Allow the engine to cool.
Symptoms of P0175 Causes
Even if you decide to let a professional handle repair for a P0175 code (which is advisable for most troubles, but some DIY tips are covered below), there are initial steps you can take. A preliminary inspection of suspected problem areas makes you more informed at the repair shop and can make the mechanic’s efforts less time-consuming.
Symptoms:
- Illuminated check engine light
- Higher-than-normal engine RPMs at idle
- Rough engine idle
- Engine sputtering or stalling
- Hard-to-start engine
- Abrupt transmission shifts at high RPMs
What to Inspect:
How to Find Air & Vacuum Leaks:
- Check hoses/lines for visible damage.
- Listen for hissing when the engine runs.
- Spray water on vacuum lines, intake components, and hose connections—if the engine sputters, you’ve located the leak.
Symptoms:
- Hesitation or jerking during acceleration
- Higher-than-normal engine RPMs at idle
- Rough engine idle
- Engine sputtering or stalling
- Hard-to-start engine
- Abrupt transmission shifts at high RPMs
What to Inspect:
To address a P0175 code, check the MAF sensor for:
- Loose wires
- Faulty connector
- Damage
- Dirt
- If needed, see a mechanic for testing and more comprehensive diagnostics.
Symptoms:
- Illuminated check engine light
- Reduced fuel economy
- Engine hesitation
- Unusual engine noise
- Burning smell or unusual odor
- Gas pedal vibration
What to Inspect:
Checking for exhaust leaks involves:
- Inspecting the entire exhaust system for visible cracks, damage patterns, or black soot buildup
- Monitoring for unusual exhaust fumes or gasoline odors around the engine bay or in the cabin
- Having an exhaust specialist diagnose and repair the system if issues are detected.
Symptoms:
- Illuminated check engine light
- Rough idling
- Reduced fuel economy
- Engine stalling or hesitation
- Black exhaust smoke
- Failed emissions test
What to Inspect:
Intermediate DIY mechanics and professional technicians can test an oxygen sensor by:
- Using a digital voltmeter to measure sensor voltage output and verify proper operation
- Checking both upstream and downstream O2 sensors for accurate readings
- Comparing readings to manufacturer specs to determine if a replacement is needed
Symptoms:
- Illuminated check engine light
- Reduced fuel economy
- Engine hesitation or stalling
- Engine misfiring
- Reduced acceleration (particularly while under load or ascending a hill)
What to Inspect:
DIY steps for fuel filter replacement:
- Only replace the fuel filter if you’re comfortable working with fuel systems and have the proper tools
- Take proper safety precautions when handling gasoline components and fuel lines
- Consider professional help if you lack the experience or the appropriate equipment
Symptoms:
- Illuminated check engine light
- Rough idling
- Engine stalling or hesitation
- Black exhaust smoke
- Gas in the regulator vacuum line
- Engine cranks but doesn’t start
What to Inspect:
To perform this diagnostic test, you’ll need intermediate mechanical experience, proper safety equipment, and a quality fuel pressure gauge. If unsure, professional mechanics are equipped to handle this procedure safely.
Symptoms:
- Illuminated check engine light
- Rough idling
- Engine stalling or hesitation
- Fuel leak/smell
- Black exhaust smoke
What to Inspect:
Fuel injector diagnostics include:
- Locating Bank 2 injectors with the engine running
- Using the screwdriver-stethoscope method:
- Place the screwdriver tip on the injector
- With your ear on the handle, listen for clicking (silence suggests problems)
Advanced test (experienced DIYers only):
- Carefully disconnect the injectors one at a time
- Monitor engine sound/RPM for changes
- No change indicates potential injector failure
Note: This last step is best performed by experienced DIYers or professional mechanics. Always observe caution around a running engine.
Symptoms:
- Illuminated check engine light
- Rough idling
- Reduced fuel economy
- Engine stalling or hesitation
- Hard-to-start engine
- Whirring noise from the fuel tank area
- Overheating
What to Inspect:
You’ll need intermediate mechanical experience, proper testing equipment (including a fuel pressure gauge), and electrical diagnostic tools to evaluate pump performance properly. Given the complexity and safety concerns, professional assistance may be the best option.
Can I drive with Code P0175?
Quick answer: Yes, driving with a P0175 code for a week or so generally won’t cause any further problems. However, to avoid dangerous conditions, don’t drive if there’s any hesitation or stalling.
Upon detecting a P0175 code, consider the next several days a grace period to find a repair shop and schedule the work. During this time, you can also conduct the DIY inspections covered earlier.
Crucially, don’t postpone fixing the problem. Extended delays make the car vulnerable to engine and catalytic converter damage and pricey repairs. At the same time, be alert for any drop in engine performance, which can create hazardous situations on the highway or at an intersection. In this case, towing the car to a service center is the safest approach.
Here’s a more detailed look at driveability with a P0175 code.
| Causes | Can I Drive? | Risks / Safety / Performance |
|---|---|---|
|
Vacuum Leak |
You can drive briefly with a P0175 code but stop immediately if engine performance changes or deteriorates. Prompt repairs are strongly recommended. |
Driving with a vacuum leak can damage the engine and cause component failure. The risk of stalling and hesitation increases over time. Prompt repairs prevent expensive damage and unsafe driving conditions. |
|
Faulty Mass Air Flow (MAF) Sensor |
You can drive briefly with a P0175 code but stop immediately if engine performance changes or deteriorates. Prompt repairs are strongly recommended. |
Operating with a faulty MAF sensor leads to poor engine performance and potential system damage. Extended driving can trigger additional sensor failures and erratic behavior. Immediate repair helps avoid costly engine complications and unsafe conditions. |
|
Exhaust Leak |
You can drive briefly with a P0175 code but stop immediately if engine performance changes or deteriorates. Prompt repairs are strongly recommended. |
Ignoring an exhaust leak risks serious engine complications. A persistent leak can lead to toxic fumes and system deterioration. Swift repairs protect engine health and passenger safety. |
|
Faulty Oxygen Sensor |
You can drive briefly with a P0175 code but stop immediately if engine performance changes or deteriorates. Prompt repairs are strongly recommended. |
Driving with a faulty oxygen sensor can reduce fuel efficiency and damage the catalytic converter. Performance will steadily decline, and emissions will increase. Quick replacement prevents more extensive and expensive repairs. |
|
Defective Fuel Filter |
You can drive briefly with a P0175 code but stop immediately if engine performance changes or deteriorates. Prompt repairs are strongly recommended. |
A defective fuel filter risks inconsistent fuel delivery and engine performance. Over time, contaminated fuel can damage injectors and fuel system components. Early replacement prevents costly system-wide damage. |
|
Bad Fuel Pressure Regulator |
You can drive briefly with a P0175 code but stop immediately if engine performance changes or deteriorates. Prompt repairs are strongly recommended. |
A faulty fuel pressure regulator causes unstable engine operation and fuel mixture problems. Continued use can damage injectors and degrade engine performance. Prompt replacement prevents extensive fuel system repairs. |
|
Damaged Fuel Injector |
You can drive briefly with a P0175 code but stop immediately if engine performance changes or deteriorates. Prompt repairs are strongly recommended. |
A damaged fuel injector leads to poor fuel atomization and uneven engine performance. Running the engine in this condition risks cylinder damage and increased emissions. Immediate repair prevents more severe engine complications. |
|
Defective Fuel Pump |
You can drive briefly with a P0175 code but stop immediately if engine performance changes or deteriorates. Prompt repairs are strongly recommended. |
A defective fuel pump risks sudden engine stalling and severe performance issues. Inadequate fuel delivery can damage multiple engine components over time. Timely replacement prevents potential system-wide failure. |
DIY | How To Fix P0175 Causes
With so many possible causes for a P0175 code, diagnostics and repairs typically require professional help. That said, working on a vacuum leak or a MAF sensor isn’t a stretch for a moderately skilled DIYer. We’ve outlined the basic steps below.
Before jumping into any car repair, take stock of your skill level. Don’t tackle anything beyond your abilities to prevent an injury risk or chance of making the problem worse. Don’t hesitate to reach out to a mechanic for assistance.
Possible Cause: Vacuum Leak
What is it?
Proper air-fuel mixture is one vital element of a smooth-running engine. A vacuum leak creates an imbalance that can lead to a higher-revving engine and code P0175.
How hard is it to fix?
Difficulty Level: Moderate
The greatest challenge to fixing a vacuum leak is finding the problem. The water spray technique (see above) only goes so far and can require more sophisticated methods that are best left to experienced hands. While replacing some vacuum lines is relatively easy, a vacuum leak involving a gasket, intake manifold, or other components requires professional intervention.
Cost of Repairs
Depending on the vehicle and the component, a replacement vacuum line will cost $50 to $150.
Possible Cause: Faulty MAF Sensor
What is it?
The mass air flow (MAF) sensor measures the air entering the engine, which determines how much fuel is sent into the combustion chamber. A dirty or defective MAF sensor affects this reading.
How hard is it to fix?
Difficulty Level: Moderate
Accessing the MAF sensor is uncomplicated in most cars, but if a replacement is involved, it requires a delicate touch and very specific steps.
Cost of Repairs
Expect to pay $20 to $40 for MAF sensor cleaner spray and supplies. A new MAF sensor costs $40 to $50.
Other DIY Considerations for Code P0175
The secret to many code P0175-related repairs is having access to the trouble spot and the proper equipment. While essential skills are also necessary, the actual work of replacing a fuel filter, oxygen sensor, or fuel injector isn’t overly complex, but getting to these components can be challenging. Swapping out a defective fuel filter or oxygen sensor requires safely working under the car. Meanwhile, installing a new fuel injector frequently involves removing layers of other components, which can be daunting for a novice. So, a more skilled amateur with the right tools can go beyond our basic DIY recommendations.
Before dealing with any code P0175-related repair, check whether your car is under warranty. You can save money by letting the automaker handle the work. In addition, research if there are any technical service bulletins (TSBs) for your car. TSBs are official repair/correction notices issued by the manufacturer that cover specific problem areas. You can research this online or contact a dealer.
P0175 Code FAQs
What makes and models does code P0175 affect the most?
Here’s a breakdown of the vehicles most affected by code P0175, according to FIXD sensor data collected in 2023.
| Make | Model | Occurrence Frequency |
| Chevrolet | Silverado 1500 | High |
| Ford | F-150 | High |
| GMC | Sierra | High |
| Nissan | Altima | High |
| Toyota | Tundra | High |
| Cadillac | SRX | Medium |
| Chevrolet | Suburban | Medium |
| Chevrolet | Avalanche | Medium |
| Ford | Ranger | Medium |
| Ford | Taurus | Medium |
| Ford | Mustang | Medium |
| GMC | Yukon | Medium |
| Lexus | IS 250 | Medium |
Why do P0175 codes happen?
Numerous situations can trigger a P0175 code, which involves a fuel condition that is too rich in Engine Bank 2. The most common problem areas include:
- Failed or dirty mass air flow (MAF) sensor
- Vacuum/air leaks in hoses or gaskets
- Faulty oxygen sensors
- Clogged fuel filter
- Bad fuel pressure regulator
- Leaking fuel injectors
- Damaged exhaust components (an exhaust leak)
The check engine light comes on when the engine control or powertrain control module detects this rich fuel mixture through sensor readings.
How do I fix P0175—System Too Rich (Bank 2) issues?
Check for common triggers of a rich fuel condition in Engine Bank 2.
- Inspect for vacuum leaks and damaged hoses
- Test MAF sensor operation and connections
- Look for exhaust system damage or leaks
- Check oxygen sensor performance
- Examine fuel pressure regulator function
- Test fuel injectors for proper operation
Most fixes require moderate mechanical skill. Complex diagnoses may require professional testing equipment. If you lack experience with fuel system repairs, consider hiring a mechanic.
How common are P0175 codes for Chevys and Fords?
FIXD sensor data shows that Chevrolets have the highest overall occurrence levels of P0175 codes than any other make. Among all Chevys, the Silverado 1500 is the worst of the worst for P0175-related problems. Meanwhile, Ford is ranked third for these issues, with the F-150 having more P0175 codes than any other Blue Oval product. Nissan sits between Chevy and Ford, primarily due to the P0175-prone Altima.
References:
Repair-cost estimates, repairpal.com (various dates). Retrieved October 29, 2024, from repairpal.com.
Dave Goldberg is an automotive journalist and lifelong car fanatic. He writes for numerous enthusiast and business outlets and is an ongoing contributor to HotCars.com, one of the most popular car culture websites. When he’s not writing or driving, Dave is either under a hood or asleep. His credentials include a BA in Journalism from The George Washington University.
