Q: I have an 2002 Infiniti i35 which had a code reading “P0301” for bad coil

asked by on March 08, 2018

I have an 2002 Infiniti i35 145,125mileage with (Check Engine Light) On which had a code reading “P0301” for bad coil misfiring, so I replaced all 6 coils packs and including all 6 spark plugs as well. After I had gotten done replacing all 6 coils packs and all 6 spark plugs, code is still reading “P0301” for bad coil misfire. So what I tried was hard setting the code by disconnecting the battery for 1 hour from terminals and replaced the terminals back on to the battery to clear the “P0301” code but nothing happen after I did that. What should I do?

My car has 145125 miles.
My car has an automatic transmission.

You will need to have the number one cylinder injector tested to see if it is getting signal from computer and cylinder compression to see if it has an internal engine problem. Then if these are okay then will need to check coil wiring to see if it sparks and if not then wiring or computer is the issue.

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

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

P0133 code change O2 sensor two times still sets the same code after about 200 miles.

Hi there. From the description you have given, for your vehicle's P0133 code (O2 sensor slow response). It could be an exhaust leak near the O2 sensor causing the O2 slow response code. An exhaust leak could draw air in...

Car does not start after crash

If the vehicle was involved in an accident, there is a good chance the inertia switch has killed the power to the fuel pump. This is a safety switch that is designed to kill the power to the fuel pump...

5r55e transmission issue

Hello. Transmission shifting problems can be caused by a wide variety of issues. A few common causes are issues with the fluid, torque converter. Automatic transmission operate using fluid pressure. If the transmission fluid is dirty or contaminated, or the...

Related articles

P2710 OBD-II Trouble Code: Shift Solenoid F Interm
P2710 means a problem in a shift solenoid has been detected due to a failing transmission and/or transmission components or an electrical issue.
P0310 OBD-II Trouble Code: Cylinder 10 Misfire Detected
P0310 P0310 Code Definition The P0310 code is a generic powertrain code related to the ignition system or misfire. In this case, a misfire has been detected specifically in cylinder number 10. Codes related to the P0310 include: P0300:...
P0493 OBD-II Trouble Code: Fan Overspeed
P0493 means there's a voltage problem with the electric cooling fan control system due to a faulty fan motor, fan relay, wiring, fan fuse, or sensor.