Having problems with your 2001 Mitsubishi Galant ?

I have been getting the P0421 code since June 2006. I replaced the O2 sensor that sits at the front this January, and the code is still there. I am scared to death that I am about to be autoless. I have been talking to too many people with too many, maybes, and I have apparently thrown money at the wrong things. I hope you can help, I have several questions: First -- did I replace the wrong sensor? 2nd -- Could my Cat be bad, since I do get a bad smell when the car first starts up after sitti

Posted / edited by AnonymousUser on : 19-02-2018

Answers :

How many oxygen sensor are they on 2000 silverado
Replacing an O2 sensor might fix the problem, but it will not erase the code. Try disconnecting the negative lead from the battery for 20 minutes, then reconnect and start your car. This should erase the code set in the ecm if in fact the O2 sensor you replaced was faulty.
Repair Help & Product Troubleshooting for 2001 Mitsubishi Galant

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