O2 sensor problem. P0135
Thread Starter
Racer
Joined: Jan 2011
Posts: 275
Likes: 2
From: Tucson Arizona
O2 sensor problem. P0135
This DTC popped up a few weeks ago and in my search for the cause I found that the plastic restraint on the passenger side had broken and the connector came into contact with one of the header tubes.
http://millam.tackitt.net/DSC02454.JPG
I have adaptors to use the rear O2 sensors for the front O2.
I found no short circuit caused by the burn. All of the wiring leading to the sensors is in good shape and routed safely.
I replaced the O2, fixed the restraint, and cleared the DTC. The DTC came on again so I checked the underhood fuses. All good there.
This is not a constant DTC either. Some days it is there and some days it is not.
With the other electrical problems going on I am changing out the battery. Mine tests good on every test run but an exchange will help remove all doubt.
http://millam.tackitt.net/DSC02454.JPG
I have adaptors to use the rear O2 sensors for the front O2.
I found no short circuit caused by the burn. All of the wiring leading to the sensors is in good shape and routed safely.
I replaced the O2, fixed the restraint, and cleared the DTC. The DTC came on again so I checked the underhood fuses. All good there.
This is not a constant DTC either. Some days it is there and some days it is not.
With the other electrical problems going on I am changing out the battery. Mine tests good on every test run but an exchange will help remove all doubt.
Thread Starter
Racer
Joined: Jan 2011
Posts: 275
Likes: 2
From: Tucson Arizona
Heck. It turns out that the two(!) Bosch sensors were bad. So when I swapped one out I still had the problem. I tested the circuit and had power to the sensor and both sensors read ~4.8Ω. But I swapped with one of my stock O2s and now things are OK.
Unusual for two to be bad.
Unusual for two to be bad.
Racer
Joined: Mar 2021
Posts: 255
Likes: 72
From: Maryland
*Thread Bump* P0135 code, blown mini fuse
This DTC popped up a few weeks ago and in my search for the cause I found that the plastic restraint on the passenger side had broken and the connector came into contact with one of the header tubes.
http://millam.tackitt.net/DSC02454.JPG
I have adaptors to use the rear O2 sensors for the front O2.
I found no short circuit caused by the burn. All of the wiring leading to the sensors is in good shape and routed safely.
I replaced the O2, fixed the restraint, and cleared the DTC. The DTC came on again so I checked the underhood fuses. All good there.
This is not a constant DTC either. Some days it is there and some days it is not.
With the other electrical problems going on I am changing out the battery. Mine tests good on every test run but an exchange will help remove all doubt.
http://millam.tackitt.net/DSC02454.JPG
I have adaptors to use the rear O2 sensors for the front O2.
I found no short circuit caused by the burn. All of the wiring leading to the sensors is in good shape and routed safely.
I replaced the O2, fixed the restraint, and cleared the DTC. The DTC came on again so I checked the underhood fuses. All good there.
This is not a constant DTC either. Some days it is there and some days it is not.
With the other electrical problems going on I am changing out the battery. Mine tests good on every test run but an exchange will help remove all doubt.
I am not running headers, but I've recently started blowing the 02 sensor fuse in my 04. Replaced it and drove on a 4-5 trips yesterday and the CEL came back on start up on my last errand.
I need to pass emissions inspection and it's just hilarious that it's doing this to me a few weeks before it's due.
If the fuse keeps blowing is it a short circuit/wiring issue? This is the only code i get. Car seeeeems to be a little chuggy but hard to tell when it's so hot outside.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,319
Likes: 3,927
From: Cape Coral, Florida
I am not running headers, but I've recently started blowing the 02 sensor fuse in my 04. Replaced it and drove on a 4-5 trips yesterday and the CEL came back on start up on my last errand.
I need to pass emissions inspection and it's just hilarious that it's doing this to me a few weeks before it's due.
If the fuse keeps blowing is it a short circuit/wiring issue? This is the only code i get. Car seeeeems to be a little chuggy but hard to tell when it's so hot outside.
I need to pass emissions inspection and it's just hilarious that it's doing this to me a few weeks before it's due.
If the fuse keeps blowing is it a short circuit/wiring issue? This is the only code i get. Car seeeeems to be a little chuggy but hard to tell when it's so hot outside.
Racer
Joined: Mar 2021
Posts: 255
Likes: 72
From: Maryland
I cleared the code and see what happens next. When it did it yesterday I was driving it a LOT and it definitely was probably pretty hot down there by the time I got home.
