O2 Sensor fault on both banks indicated
Thread Starter
CF Beginner
Joined: Dec 2014
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O2 Sensor fault on both banks indicated
I am getting DTC codes P015B, P015D that I had the local Chevrolet dealer read out via their DTC reader.
The tech gave me a print out that says these are for Bank 1, sensor 1 and Bank 2 sensor 1 which if I understand is both the driver and passenger side sensors before the cat.
I also have a Superchips programmer that has fixed programs that you load in. I have uploaded the one that allows me to run premium 93 gas. While I don't know the intricacies of what the program internals are doing, I do know that it tweaks the engine and the transmission as part of the program change. I have been quite satisfied with performance of the truck with the Superchips program as I do a lot of interstate 70 - 80 mph driving and with the low price of gas, why not.
I also have a K&N Cold Air Intake system that I have installed on the truck
Replacing the sensors seems to be a straight forward job that I can do with ease after watching the video.
My question is whether the Superchips program could be impacting the sensors and causing the fault.
P015B - HO2S delayed Response Lean to Rich Bank 1 Sensor 1
P015D - HO2S Delayed Response Lean to Rich Bank 2 Sensor 1
The above is a verbatim transcription of the report he ran off of his computer in the dealer service area
I have run the premium gas program for quite some time, fault free, so I'm inclined to think that it isn't the program, but wanted to put this out there and get some feedback on other things to check.
The truck has 96,600 miles on it of which it is probably 60% highway, 40% in town traffic.
Since both sides of the engine seem to be effected I also think that it is less likely to be an exhaust leak via a gasket leak but again, I don't know the nitty gritty details of the exhaust plumbing, etc.
Any thoughts are more than welcome.
Anything I can tackle before heading off to the dealer I'd like to do.
The tech gave me a print out that says these are for Bank 1, sensor 1 and Bank 2 sensor 1 which if I understand is both the driver and passenger side sensors before the cat.
I also have a Superchips programmer that has fixed programs that you load in. I have uploaded the one that allows me to run premium 93 gas. While I don't know the intricacies of what the program internals are doing, I do know that it tweaks the engine and the transmission as part of the program change. I have been quite satisfied with performance of the truck with the Superchips program as I do a lot of interstate 70 - 80 mph driving and with the low price of gas, why not.
I also have a K&N Cold Air Intake system that I have installed on the truck
Replacing the sensors seems to be a straight forward job that I can do with ease after watching the video.
My question is whether the Superchips program could be impacting the sensors and causing the fault.
P015B - HO2S delayed Response Lean to Rich Bank 1 Sensor 1
P015D - HO2S Delayed Response Lean to Rich Bank 2 Sensor 1
The above is a verbatim transcription of the report he ran off of his computer in the dealer service area
I have run the premium gas program for quite some time, fault free, so I'm inclined to think that it isn't the program, but wanted to put this out there and get some feedback on other things to check.
The truck has 96,600 miles on it of which it is probably 60% highway, 40% in town traffic.
Since both sides of the engine seem to be effected I also think that it is less likely to be an exhaust leak via a gasket leak but again, I don't know the nitty gritty details of the exhaust plumbing, etc.
Any thoughts are more than welcome.
Anything I can tackle before heading off to the dealer I'd like to do.
CF Monarch
Joined: Jul 2011
Posts: 5,920
Likes: 140
From: kevinkpk
"I also have a K&N Cold Air Intake system that I have installed on the truck", Has this happened since your issue? It could also be just coincedence of both o2 sensors. Is there no after cat sensor problem? I'd say if not you have cat issues. You have no performance issues?
Thread Starter
CF Beginner
Joined: Dec 2014
Posts: 3
Likes: 0
The cold air system has also been in for a while previous to the sensor problem so I don't think it is the issue. Could be wrong though. Not as long as the 93 octane program install which is maybe 2 years since install, but probably 6-8 months cold air install before sensor issues.
Also didn't mention earlier that the b sensor went out a couple of months earlier than the d sensor.
Performance is fine.
As an additional note, I got up yesterday morning to drive about 100 miles to and from an appointment and when I started car the engine check light was out.
Drove to and from the appointment without the check engine light illuminating.
One big difference being that it has been hot here (mid 90's) and yesterday it was substantially cooler due to rain from the tropical storm nearby.
I wonder why both sensors would appear to clear and neither one fault on this trip of 60 - 80 mph interstate driving.
Also didn't mention earlier that the b sensor went out a couple of months earlier than the d sensor.
Performance is fine.
As an additional note, I got up yesterday morning to drive about 100 miles to and from an appointment and when I started car the engine check light was out.
Drove to and from the appointment without the check engine light illuminating.
One big difference being that it has been hot here (mid 90's) and yesterday it was substantially cooler due to rain from the tropical storm nearby.
I wonder why both sensors would appear to clear and neither one fault on this trip of 60 - 80 mph interstate driving.
Last edited by wsquared1958; Sep 3, 2016 at 5:36 AM. Reason: correct typo's and add additional text