Skip the auto shop - Our mechanics make house calls

Q: P0302 (rear rotor misfire) and CEL not going away

asked by on

Hey, the CEL keeps popping up at around 8k rpm and i dont know why. I hooked it up to my scanner and it still says P0302 cylinder 2 misfire. I changed coils plugs and wires and it still keeps happening. Im not experiencing any loss in power or anything, its idling smooth but the damn light wont go away and blinks when i rev it high. Its got me really worried, any suggestions on what i should do next? Thanks, lukas

My car has 39000 miles.
My car has a manual transmission.

Hey there. Your engine is misfiring but not until your engine is at high RPMs. The cause can be that you are not getting enough fuel or spark to the cylinder. You should have the engine cleaned of carbon, clean the injectors or replace them, make sure you are using high quality coils, wires, and plugs. All of these items can cause these problems. You should also clean the mass air sensor with cleaner to make sure the vehicle is not running too lean. For help having the Check Engine Light cleared, a certified professional from YourMechanic can come to your location to diagnose and repair the cause of the code.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Water damage

Hi. I'm sorry, I need a few more details in order to aid with your inquiry. If your passenger floorboard is wet, you may have a leaking heater core. If the vehicle is not starting properly and you believe the...

Q: Why did my rx8 turn off out of nowhere while I was driving it ?

Hello, thank you for writing in. There are several reasons why an engine would stall. The first thing you want to do is to look over the engine and make sure there are no obvious issues. Check the electrical connections...

Q: Cylinder 3 misfires.

Hi there. From the description you have provided, a lot has been done to overcome your vehicle's engine misfire issue. Due to the many possibilities, that can cause a cylinder misfire (ie; spark plug, ignition coil, fuel injector, vacuum leak,...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...