hey, i just got a 98 R/T coupe. When I bought it, the guy (neonmike, on here btw) let me know it needed a downstream o2 sensor and had the cel coming on and off and gave me a used one with the car that he said he got out the junkyard. So the car has been throwing code p0140 for the last couple of days and today I put the oxygen sensor he gave me in, Had to heat up the old one to get it out! and cleared the code with my little pocket scanner. I test drove the car to get some oil change stuff from Autozone. On the way it throws the code again. i scanned it and erased it and it came right back on. so i figured the o2 sensor he had got out the jy was trash, so i bought a new one from Advance on the way back, 65 bucks!
. Its a Bosch one that looks really different from the one that was on the car, but had the same plug so i figured it was good. I put it in and did my oil change and went for a ride. About five minutes on the highway and the cel came back on, i scanned it and it was the same p0140 i erased it and it came right back. What else to i need to check? do i need a converter? any input on how to keep the code off and from coming back would be great. Thanks! - Tony