Codes P0172 and P0401?

Tiny
JOE1953
  • MEMBER
  • 2000 TOYOTA CAMRY SOLARA
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 173,000 MILES
What causes error codes P0172 and P0401? What is the meaning of them and how to fix them?
Wednesday, January 29th, 2025 AT 1:24 AM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,533 POSTS
So these are two different problems, please make a new post for the Code P0401.

Code P0172 - System Too Rich (Bank 1)

Code P0401 - Exhaust Gas Recirculation (EGR) Flow Insufficient

The system is running too rich, this is usually because of an exhaust leak up by the exhaust manifolds or a leaky fuel injector, how is the engine running? Please go over this guide which will help by showing us what can cause this issue.

https://www.2carpros.com/articles/why-an-automotive-engine-will-run-rich

Please upload a video in your response of the engine idling to help me see what's going on.
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Wednesday, January 29th, 2025 AT 10:18 AM
Tiny
KEN L
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Any luck on this one?
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Monday, February 3rd, 2025 AT 8:41 AM

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