1996 T&C code 0135

The light is on again. Any insights are appreciated. Thanks.

Ken

 

O2 sensor heater circuit malfunction (bank1 sensor 1) Left O2 #1 heater

 

Just how are you getting this fault code? Have someone connect a good scan
tool to this vehicle and then tell me what the code says, Not a P-code and
do NOT retrieve the fault code by cycling the key on and off.

Glenn Beasley
Chrysler Tech

 

is it a 3.0 ?

 

Glenn,

I used an el cheapo scan tool which I used to successfully diagnose
other, similar problems. In the past, I have found that this scan tool
agrees with the one I rented from Autozone. I don't know how this
squares with your criteria for "good".

The information that Ed M provided, I already was able to determine.
Does this information help?

Thanks,

Ken

 

It's a 3.8

Thanks,

Ken

 

Ok assuming this code you are getting on the ole cheapo scan tool is
detecting the upstream o2 heater failure. You say the lite is on again and I
don't have the original post or what was done before. A good scan tool will
force run the 02 heater test and help in diagnosing the problem.
The heater element helps the 02 reach a faster operating temp for better
emissions.
Disconnect the 02 sensor, key on and check for 12 volts at the DG/OR (pin#
2)wire of the 02 connector harness side. and key off check for a good ground
at the 02 sensor harness side BK wire (pin #1) if that checks good, take
your ohm meter, key off disconnect 02 sensor and check the element of the
sensor for resistance. There should be between 4 and 20 ohms. Make sure you
do the test on the upstream sensor and not the downstream sensor.

Glenn

 

Got it. Thanks for the detailed information, Glenn.

Ken

 

Ken, you say it is on again. Did you do anything to fix it the last time? If
this is the original 02 sensor you may as well replace it while doing the
test.
Glenn

 

you need to take a dvom and measure the heater voltage coming from the pcm to
the sensor in question but it should be measured in a cold start condition.if
it maches spec voltage then the sensor is junk

 

maxpo

I replaced this sensor once before. I think it's been a couple of years
at least. The code was different; it wasn't the heater. It seems the
output voltage was simply out of spec. Probably because it was an
original sensor and, at around 150K miles, gave up.

It seems like this was a bit too soon to have another problem with the
same sensor. Could be the sensor, but your information regarding heater
resistance is very useful as it could also be a poor connection.

One of the reasons I posted this is to fish around a bit to see if there
is something else to be learned. For instance: a response of, "Oh
yea...that's a typical indication you get when the xxxxxxx needs to be
tightened" would make me feel less humble after changing out a perfectly
good O2 sensor. Thanks for your help.

Ken

 

You lost me here! But just because you put an 02 sensor on a few years ago
does not mean that sensor is bad again.

Glenn

 

Sorry. My point exactly.

Ken