2002 Mitsu Eclipse RS 2.4L - Check Engine Light?

Question

I have the aforementioned car, and the check engine light came on a few weeks back. I took it in to the shop, had it checked and was told it was my O2 sensor, I replaced it, seemingly the car is getting better mileage now. But then the light came back on with the same code. The sensor is installed properly, and is brand new. The only engine mod to the car is a cold air intake. What could be causing this sensor to continuously pop?

Answer 1

liquid gas will kill an o2 and so will cheap aftermarket o2 sensors that people buy and put in themselves trying to save money should of let the shop install then it would have been covered under warranty labor and all