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Your Confirmed Fix & Cost:

Replace Spark Plugs

Cost: $66-$250, depending on if you go to a repair shop or do it yourself. These prices are based on national averages. Other repairs may be needed.

new spark plug versus old, worn-out spark plug

Confirmed Fix & Cost for P0300-P0312

FIXD has scanned over 18 million vehicles for check engine codes. Based on our data, the most likely fix for your vehicle and your diagnostic trouble code is spark plug replacement. This fix is not guaranteed to resolve your issue and other repairs may be needed.

Cost to Replace Spark Plugs at Mechanic

$191-$250

Parts: $66-$91, Labor: $126-$158

Replacing the spark plugs usually takes between 1-4 hours, depending on the vehicle and if other repairs are needed. This service should be completed about every 30,000 miles, or as specified by your owner’s manual. Find a RepairPal Certified shop near you for trusted repairs at a fair price.

Cost to DIY Spark Plug Replacement

$66-$91

DIY Difficulty Level: Intermediate

You can reduce the cost to replace spark plugs by doing this job yourself. Your exact replacement cost will also depend on how many spark plugs are needed (typically between 4 and 16) and whether you choose long-life platinum-tipped spark plugs or cheaper conventional ones. 

For a More Accurate Diagnosis, Find a Trustworthy Repair Shop Near You 

Codes P0300-P0312 mean your engine is misfiring. Misfires can be caused by anything from worn-out spark plugs to vacuum leaks to low engine compression. While replacing your spark plugs may be the most likely fix, this is not guaranteed to solve your specific issue. If you are not comfortable diagnosing this issue or performing repairs yourself, we recommend finding the nearest RepairPal Certified repair shop to accurately diagnose this code for you.

The Average Cost to Replace Spark Plugs Is $66-$250, Depending on if You Go to the Mechanic or DIY. This price range is based on national averages for all vehicles and does not factor in taxes, fees, or your particular make and model. Related repairs or maintenance, such as O2 sensor replacement, fuel filter replacement, and new spark plug wires may also be needed. For a more accurate estimate based on your make, model, and location, use the RepairPal Fair Price Estimator. Get a more accurate estimate for your spark plug replacement using RepairPal’s Fair Price Estimator: SEE MY COST

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What Does Chevrolet Code P0300 Mean? P0300 definition: Random, Multiple Misfire Detected Issue Severity: SEVERE – Stop driving immediately Repair Urgency: Fix this code immediately (same-day if possible) to avoid ignition failure, catalytic converter damage, and dangerous conditions Diagnosis: A multiple misfire can be caused by anything from faulty spark plugs to low engine compression. Because there are so many variables that could cause a misfire, the best cost savings is to take your car into a shop to have it diagnosed as quickly and accurately as possible. Find a Certified Shop We’ve partnered with RepairPal to recommend trustworthy shops

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Replacing the spark plugs is an intermediate level repair that should take less than an hour on most vehicles. Here’s everything you need to know to replace spark plugs successfully. DIY difficulty: Intermediate Replacing the spark plugs on a car is an intermediate level task for most DIYers. While beginners may require assistance, it’s a relatively simple task that even those with little car repair experience can complete successfully in an hour or less. Cost to DIY: $66-$91 This estimate includes the price for spark plugs. It is advisable to replace spark plug wires as well while doing this job.

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