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Codes P2a00 and P1172

Tiny
STRATTON.M23
  • MEMBER
  • 2006 HONDA CRV
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 158,000 MILES
The check engine light is on and the coded read p2a00 and p1172. I have read online that this can indicate the upstream sensor is failing. Is this correct? It also says a software update is required, is this also correct?
Friday, April 2nd, 2021 AT 8:46 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,616 POSTS
Yes, it sounds like the primary oxygen sensor has failed. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Saturday, April 3rd, 2021 AT 11:10 AM
Tiny
STRATTON.M23
  • MEMBER
  • 20 POSTS
Have you heard of needing a software update on the CRV to fix this problem? I read it needs to be done before changing the sensor or the sensor will end up failing.
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Saturday, April 3rd, 2021 AT 3:21 PM
Tiny
KEN L
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  • 47,616 POSTS
I have not heard of this, but it could be true. The only way is to have an update done and then change the sensor.
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Sunday, April 4th, 2021 AT 9:45 AM
Tiny
STRATTON.M23
  • MEMBER
  • 20 POSTS
I have to order the upstream sensor but the online is recommending ordering the downstream as well. Do I need to replace both if only the upstream is sending the code?
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Sunday, April 4th, 2021 AT 9:49 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,616 POSTS
I would just do the upstream sensor first to see what happens.
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Sunday, April 4th, 2021 AT 9:57 AM

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