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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. P0302 (rear rotor misfire) and CEL not going away

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: Car lost power after being serviced

There is a recall for this problem of no power, and it may fix the the issue by increasing the oil flow during startup and changes to engine ignition timing to increase power. When the car was serviced, they may...

Q: starts up great...as soon as it warms up in about 8-10 mins it will stall. Must cool down before it can start again.

Hi there: In most cases, the issue you're describing is caused by a fuel and air mixture issue that is caused by either the idle control valve, EGR valve or the mass airflow sensor on your 2005 Mazda RX8. As...

Q: Rough idle/Check Engine light/Cylinder # 2 misfre

Hello, thank you for writing in. The spark plugs may absolutely be the cause of your misfire. Even if only one cylinder is registering a misfire at this time, you should replace all of them at the same time. The...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.