On Apr 25, 10:42 am, "Mike" > wrote:
> > wrote in message
>
> ...
>
> >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'?