SPONSORED LINKS

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
  • 48,363 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.
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
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.
Was this
answer
helpful?
Yes
No
Saturday, April 3rd, 2021 AT 3:21 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 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.
Was this
answer
helpful?
Yes
No
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?
Was this
answer
helpful?
Yes
No
Sunday, April 4th, 2021 AT 9:49 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I would just do the upstream sensor first to see what happens.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, April 4th, 2021 AT 9:57 AM

Please login or register to post a reply.

Related P1172 Content

Sponsored links