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Codes P0171 and P0172?

Tiny
KIMBERLEY COLTON
  • MEMBER
  • 2006 SUZUKI AERIO
  • 2.3L
  • AUTOMATIC
  • 124,500 MILES
My vehicle listed above SX model has started throwing the above codes. They both pull bank 1. I didn't notice any difference in driving at first, but it's starting to feel as if its having issues accelerating. I took pictures of the codes, as well as live scan. Just looking for ideas on what could be wrong before I go dumping too much money into it with the mechanic.
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Monday, May 1st, 2023 AT 9:04 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,289 POSTS
Here is what is said about the codes:

The codes P0171 and P0172 refer to a problem with the fuel mixture in the engine.

P0171 is a "System Too Lean (Bank 1)" code,

P0172 is a "System Too Rich (Bank 1)" code,

The fact that it goes from to rich to the lean I need to ask of the exhaust system is in good shape no leaks. If so, is the engine misfiring? Can you upload a short video of how the engine is running? If everything is okay, I would replace the primary oxygen sensor. Here is the location, Check out the images (below). Please let us know what happens.
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Tuesday, May 2nd, 2023 AT 9:52 AM
Tiny
KIMBERLEY COLTON
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  • 3 POSTS
Everything seems to run okay. Same as it always has since I got the car in October anyway.
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Tuesday, May 2nd, 2023 AT 11:35 AM
Tiny
KEN L
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Okay, because the system goes from rich to lean, I would replace the oxygen sensor (primary).

Here is a guide to help walk you through the steps:

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor
Please let us know what happens.

Please go over this guide and report back.

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Wednesday, May 3rd, 2023 AT 11:20 AM
Tiny
KIMBERLEY COLTON
  • MEMBER
  • 3 POSTS
Just wanted to respond now that I feel safe with the answer. I replaced the air filter because it was pretty gunked up, and then cleaned the MAF sensor. I cleared the codes, and it seems to be good to go.

Thank you for your help!
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Tuesday, July 18th, 2023 AT 8:44 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,289 POSTS
Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
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Thursday, July 20th, 2023 AT 10:17 AM

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