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O2 Sensor Question


jdnet
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Hey guys,

Here's my problem. I'm looking for the location of my downstream O2 sensors (catalyst monitor sensors) and for the life of me I can't find them. I know where the heated 02 sensors are and the others should be just below it. Ran the scanner and it's only showing the heated ones. Is it safe to assume the downstream sensors were not installed for the JDM model of my vehicle?

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Hey guys,

Here's my problem. I'm looking for the location of my downstream O2 sensors (catalyst monitor sensors) and for the life of me I can't find them. I know where the heated 02 sensors are and the others should be just below it. Ran the scanner and it's only showing the heated ones. Is it safe to assume the downstream sensors were not installed for the JDM model of my vehicle?

Hi JD,

Not every vehicle had downstream O2 sensors installed. My Mitsubishi has a sensor just after the catalytic converter but Mitsubishi refers to it as a exhaust high temperature sensor rather than an Oxygen sensor (which is what they refer to the upstream one as). Some vehicles genuinely have two O2 sensors.

This link might help you figure this out for certain. It carries parts catalogs for Jap brands except Suzuki and Mazda and you can go through the parts diagram for your car which will point out if yours has that sensor originally and what the original part number for that is.

But having said that if the scanner does not show you a downstream O2 sensor, it probably doesn't have one. Failure of O2 sensors (upstream or downstream) nearly always triggers a check engine or exhaust/catalytic converter failure light on the dashboard.

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Yeah I rechecked everything and I guess I don't have the downstream ones. Sucks to be me because I bought all the parts off a U.S. catalog assuming it would be the same so I'm left with two downstream sensors that are worthless. The upstream ones work though.

I think you forgot to paste the link. If you do get a chance to post it, I would be grateful.

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Sorry JD, here is the link.

http://www.epc-data.com/

The only complaint I have about this site is they don't have the original diagrams that should be on the catalog pointing to where the part is in the car so you have to go by the name. But I managed to find all the numbers I needed from them.

Is this for the IO? Even I have found a good resource of parts http://www.mitsubishipartscenter.com but sadly they don't ship outside the US. Prices seem to be very good though I wonder if they are genuine.

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No it's for the Tribute. Got the parts off rockauto.

Everything else seems to work fine though. The only issues so far are with the tie rods and sensors. The tie rods were a lot larger than the originals. I'm guessng they may have put in a more heavy duty suspension. Eitherway I did mod them and get it to work.

Thanks for the link. Will take a look.

Edited by jdnet
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No it's for the Tribute. Got the parts off rockauto.

Everything else seems to work fine though. The only issues so far are with the tie rods and sensors. The tie rods were a lot larger than the originals. I'm guessng they may have put in a more heavy duty suspension. Eitherway I did mod them and get it to work.

Thanks for the link. Will take a look.

In the US there was a time that the extra emission control sensors were only fitted to models sold in California to comply with regulation. It could be that the downstream O2 sensor appears on the California (or the model destined for the US) model but not on other models.

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