Code P0036, what is causing this code?

Tiny
LAVELL11
  • MEMBER
  • 2008 PONTIAC GRAND PRIX
  • 5.3L
  • V8
  • AUTOMATIC
  • 171 MILES
Need help. What else is causing this code? I changed my sensors again this time with ntk top and bottom. My wires are not damaged on both sensors they look good, and my car drive good. What else can I change to fix before emission?
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Wednesday, April 23rd, 2025 AT 6:52 AM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,685 POSTS
We need to make sure you are changing the correct oxygen sensor. Also, you need to check the EMISSONS 1 fuse - 15 AMP in the fuse panel under the hood. Also, make sure to clear the codes once the repairs have been made.

P0036 - HO2S Heater Control Circuit (Bank 1 Sensor 2)

Here is the location of the sensor to be changed out. Check out the images (below). Please let us know what happens.
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Wednesday, April 23rd, 2025 AT 11:08 AM
Tiny
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Okay thanks, just got off work I will review what you said and check the fuse under hood.
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Wednesday, April 23rd, 2025 AT 11:45 AM
Tiny
KEN L
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Sounds good, I hope it is just the fuse.
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Thursday, April 24th, 2025 AT 8:26 AM
Tiny
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These are the sensors I have now brand new and yes, I changed all the fuses somewhere old but that department good, but this code still remains. Drove home just now from work it came back on p0036 nothing else and my car still perform as usual no major problems but I'm getting loss now maybe a wire I just don't know where to start checking.
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Thursday, April 24th, 2025 AT 12:14 PM
Tiny
KEN L
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Okay, then this will be a wiring issue or the PCM is bad. Here is a guide to help you check the wiring with the wiring diagrams in the images below.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Let us know what you find.
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Friday, April 25th, 2025 AT 9:04 AM
Tiny
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Okay, thanks.
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Friday, April 25th, 2025 AT 12:00 PM
Tiny
KEN L
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Np, have a good week, Let me know what happens please.
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Sunday, April 27th, 2025 AT 11:27 AM
Tiny
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Okay, no problem.
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Sunday, April 27th, 2025 AT 11:29 AM

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