I had a problem of the engine misfiring and blowing lots of white/dark smoke and it turned out to be bad injectors. I had my mechanic put in brand new injectors in the back and newer injectors in the front, along with a fuel rail and now the car doesnt misfire after its warm. I test it all day today and its fine.

So if your car is misfiring especially when the car is warm and coils are fine then replace the fuel injectors.

Only problem now is that the check engine light came on and it gave 0303 which means the front left heated O2 sensor. Do you guys think that O2 sensor went bad or do I need to reset the engine light? I tried resetting it but didnt have enough time and the light came on moments later and is still on.

Thanks to everyone that gave me advice in my previous threads.

 

You reset it and it came back on, or you didnt reset it? If you did reset it and it came back on, sounds like you should change it.

 

0303
Diagnostic Trouble Code 0303 indicates a problem with the front Oxygen Sensor on the left cylinder bank. The left bank is also called the front bank. It is cylinders 2,4,6. A normal signal sweeps back and forth between 0.2 volts and 0.8 volts. This malfunction was detected when the Engine Control Module received a signal from the sensor which was a constant value of approximately 0.3 volts.

Possible causes include ...
- Harness or connectors (the sensor circuit is open or shorted).
- Defective Oxygen Sensor


I resetted it but I didnt think I did it right. I am going to try to reset it again but does anyone know the exact location of it? I have a feeling the idiot mechanic forgot to plug it in or something.

 

i replaced my injectors and soon after the o2 0303 came on, then i reset it, and it hasnt come back

 

I didnt have time today to go to the car and try to reset it. I drove it all day long and it drove amazing. I am falling in love with my car again. I felt a drop in the performance, especially on the highway. I am sure its because of the CEL. If the reset doesnt work then can you guys direct me on how to go about changing or testing it?

 

How much did the injectors cost...Is it DIY job?

 

Brand new ones you can get for 90 shipped. There is a DIY in the how to section but its only for one. I had my mechanic do all of them for me.