Hi,

We have a 2003 Honda Accord EX 4 Door Auto Non-California with VIN series _CM5_. It was throwing a P0141 error which shows as Oxygen Sensor Bank 1 Sensor 2 which is shown as the sensor after the catalytic converter.

I pulled that sensor out and as per the diagnostics, checked the resistance across the black / gray wires on it (it is a 4 wire sensor) and there was absolutely no resistance at all. That would pin point the sensor as defective and I then replaced it with a Walker OE unit that came with all the connectors, auto body gaskets and cable pre-made which fit perfectly. The Walker part number was 250-24476 which shows as replacing Honda / Acura part numbers 36532-RAA-A01 and 36532-RAD-L11.

With the original sensor, if the battery was disconnected the check engine light would come back on within 2 or 3 seconds after the car was started. After I replaced it with the Walker sensor, the light stayed off during 10 minutes of idling. However, once we started driving the car, the light comes back on after 3 to 10 minutes of driving every time we reset it. It is still showing the same error as P0141. I checked the new sensor and I do have resistance of between 8.8 and 17.6 depending if it is totally cool to rather hot after the car has been running.

The only error I have seen is the P0141 and it did not change after the sensor was replaced. It just takes longer to come up now with the new sensor.

Does anyone possible have an idea why it would be throwing the same error after a sensor that tested defective was replaced? I am stumped at this point.

Thanks in advance!

 

Just for grins and giggles; try tagging on an extra ground wire to the heater circuit ground wire and take it straight to the block.
Next would be to hook up a multimeter to the heater circuit positive wire and watch to see if the voltage falls out.
The code you have deals with the heater circuit of the sensor, so you are either losing power to the heater, or ground from the heater, or the sensor is flaky.
I'll go snoop around ISIS to see if there is any more info that might help you.

 

Well, if hondadude is correct and that the code refers to the heater circuit... I have seen one 03-05 Accord throw a heater code. One of the techs replaced the O2 as you did. Started the car, the MIL turned on right away. As he was stumped, I pulled out the service manual, it pointed us towards the ETM because there's a fuse in that circuit.. Found the missing fuse, problem fixed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by casualobserver &raquo;</TD></TR><TR><TD CLASS="quote">I pulled that sensor out and as per the diagnostics, checked the resistance across the black / gray wires on it (it is a 4 wire sensor) and there was absolutely no resistance at all. That would pin point the sensor as defective...</TD></TR></TABLE>When you say 'no resistance at all' that would mean short circuit. Check for the blown fuse.

If it measured open circuit then go ahead with what Dude is saying.