I replaced 2 of 4 oxygen sensors and the one on the driver side looks new, as if the previous owner replaced it. I can not figure out how to get this check engine lighy off though. I bought a voltometer to realize idk how to use this damn thing and the instructions on what to do is foreign to me. I dont know the terms of anything, im a tree climber, not a mechanic. But i feel like its prettu simple, if i only could match the terms uses to whats in front of me. Any help is appreciated! Thank you!

 

What codes are you getting?

 

after turning the key in and off the check engine light flashes 2 n 1. Code 21 indicates a problem in the oxygen sensor circuit

 

You need to check the wiring for the O2 sensors.

 

Disconnect the battery cables and touch them together or just leave one of them off over night. If you get any codes after that you may want to get the PO# codes that provide more detailed info. If you click on the highlighted #'s it will provide some extra info.

http://dodgeram.info/Engine-Gas/OBDI/pcm_fault_code.htm

 

I would suggest looking up how to test oxygen sensors with a digital voltmeter to determine if your sensors are actually working. You could have a bad wire going from the sensor to the pcm though.

 

i will stop by the shop n try the obd. For now i will check the wiring. The voltometer is foreign to me. I dont even know what settng to put it on haha im starting from zero onowledge on that. I tried disconnecting the battery cables and the codes went off for about 4hrs. Back on again though.

 

Obd showed no codes and the sensors showed normal fluctuation. We cleared the codes to clear the check engine light and it came back on in 2mins or less... im lost

 

Is it setting the same code? It sounds like the sensors are working properly.......

 

Yeah, turning the key on n off makes it blink to the same code:21. But obd says all is working well. Idek at this point