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Received and installed my new Denso upstream O2 sensors yesterday, installed w/o using anti-seize. Took it for a drive this morning, and all ran well until I got a P1153 code. Got home, hooked up my scan tool and B2S1 was indicating fluctuating between 69 and 750 Mv. In closed loop, fluctuating between 245 and 820 Mv. From what I have been able to gather, these appear to be correct voltage ranges. Quirk with the new sensor or am I missing something?
Mods, please move this to Tech, inadvertently posted to General
Last edited by MSOH; Oct 10, 2025 at 01:01 PM.
Reason: Additional info
Received and installed my new Denso upstream O2 sensors yesterday, installed w/o using anti-seize. Took it for a drive this morning, and all ran well until I got a P1153 code. Got home, hooked up my scan tool and B2S1 was indicating fluctuating between 69 and 750 Mv. In closed loop, fluctuating between 245 and 820 Mv. From what I have been able to gather, these appear to be correct voltage ranges. Quirk with the new sensor or am I missing something?
Mods, please move this to Tech, inadvertently posted to General
Most new sensors have anti-sieze on the threads already. Just wondering why you made it a point of stating "w/o anti-sieze" ?
Why did you start another thread? Isn't this a continuation of this thread?:
See if you have any freeze frame data related to this DTC on Bank 2…the wiring when previously checked for the 450mv bias voltage looked fine for only for Bank 1 I’m assuming…I’d look for exhaust leaks as the sensors are slowly switching from lean to rich…best way to look for leaks below… you replaced both upstreams ??…the only thing that was changed is the right side O2 sensor so possibly a bad new sensor ??…maybe spray the connector with DeOxit ??…where were these sensors purchased from ??
Both upstreams were purchased from Summit Racing and installed yesterday, no Amazon or ebay here! Watching the right upstream, at idle was going between 69 and 750 Mv. Left side was switching similarly.
If you didn’t have an 1153 before the sensors were changed I’m thinking maybe a bad O2….maybe try swapping O2’s and see if it goes over to Bank 1 and sets a P0133.
I thought about that, old aviation check! (We both have aviation backgrounds!). Funny thing, I have now run it through 5 separate ignition cycles, letting it idle about 5 min each time and has not set a code so far.
I thought about that, old aviation check! (We both have aviation backgrounds!). Funny thing, I have now run it through 5 separate ignition cycles, letting it idle about 5 min each time and has not set a code so far.
Well that’s what I would suggest if it does come back.
Think I found my culprit C5. my brand new right exhaust manifold gasket is leaking! I used the method you shared for checking for exhaust leaks and lo and behold, lots of bubbles at the manifold gasket. . New one ordered from Summit.
Think I found my culprit C5. my brand new right exhaust manifold gasket is leaking! I used the method you shared for checking for exhaust leaks and lo and behold, lots of bubbles at the manifold gasket. . New one ordered from Summit.
OK, great !!...been using that method for 20 years !!
So I finally got a chance to fix my right bank exhaust leak, all looks tight now. Drove the car and got the same P1153 code, so I swapped sensors. Took the car on about a 20 mile drive and NO codes were showing. Then the next day, I drove it to work, about a 100 mile round trip. All the way in, no codes present. However, about 10 miles into the return trip, the P1153 code returned. Made a stop near my house and shut it off. After restarting, the code was present at first, but then cleared itself!? Just went out and looked at the DIC, and the PCM is currently showing no codes, not even a P1153H. I must admit I am a bit confused. Here is a screenshot of B1S1 and B2S1 while the car is running at idle..
and here are the short term fuel trims,
Everything looks to be cycling properly to me. Am I missing something?
So I finally got a chance to fix my right bank exhaust leak, all looks tight now. Drove the car and got the same P1153 code, so I swapped sensors. Took the car on about a 20 mile drive and NO codes were showing.
What does this mean? You will get an MIL before you know what code you have.
Originally Posted by OHRedSled
Then the next day, I drove it to work, about a 100 mile round trip. All the way in, no codes present. However, about 10 miles into the return trip, the P1153 code returned. Made a stop near my house and shut it off. After restarting, the code was present at first, but then cleared itself!?
Does this mean you got an MIL, checked the DIC, and the P1153C was present?
The DTC does not set until the diagnostic fails on two consecutive ignition cycles, and will The MIL will clear after 3 consecutive ignition cycles where the diagnostic does not fail.
P1153 question
. New one ordered from Summit.
