oxygen sensor codes

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signalnc
Posts: 2
Joined: Sun Mar 10, 2019 5:21 am

oxygen sensor codes

Post by signalnc »

Hi. Not sure if I am posting this in the right spot - I have a 2005 Vibe base. I was getting a p0420. I replaced the upstream oxygen sensor and the p0420 code came back. I replaced the downstream oxygen sensor (Denso) , the p0420 is gone, but now I am getting a p2238 code. Can anyone tell me what direction I need to go now? I'm thinking maybe it's the part? but not sure. TIA.
zbyers
Posts: 1767
Joined: Thu Apr 03, 2014 6:12 pm
Location: Sheffield, Pennsylvania

Re: oxygen sensor codes

Post by zbyers »

Typically P0420 is due to a bad cat, and not a bad o2 sensor. That code actually says the o2 sensors are working, in that they detected the efficiency of the cat is below the established threshold.

As for the code you now have, P2238, based on what you've done, I would lean towards the first o2 not being plugged in, or a broken wire. Basically, that code says the first sensor has no reading.

https://www.engine-codes.com/p2238_toyota.html

You can pick up a cheap bluetooth code reader on amazon/ebay. $10 for the reader, and $5 for the TorquePro app, and you can actually read darn near any sensor the car has and verify the live data.
'74 Thing, '79 El Camino, '83 VW DoKa '91 Vanagon, '03 Base, 04 GT
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signalnc
Posts: 2
Joined: Sun Mar 10, 2019 5:21 am

Re: oxygen sensor codes

Post by signalnc »

Thanks. I'll check the wiring.
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