I have a 2001 Chrysler Town and Country Limited (3.8 L) with 122K miles on it. A few months ago the check engine light came on and there where three codes 1684 (battery disconnect) , 1491 (radiator fan relay) and 0135 (O2 sensor). Two weeks ago I replaced both O2 sensors. After driving the car for a few miles the check engine light went off. A couple of days ago it came back on and the same three codes are back.
Are the O2 sensor I put in bad or is something else wrong?
Thanks in advance,
Derek
The P0135 code is O2 sensor heater circuit - bank 1 sensor one. You did check the heater circuit before you replaced the sensor, right ????
Uhhhh -seeings as how I don't know what you are talking about the answer is clearly no :).
How do you 'check the heater circuit'?
You need to check for power and ground on the wires going to the O2 heater. You will need a wiring diagram and a multi-meter to check for power and continuity. You could check all the fuses as the power to the heater should be on a fuse. I don't know which fuse it would be but just check them all and replace any that are blown.
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