Code P0172

Tiny
LALMEN21
  • MEMBER
  • 2009 CHEVROLET HHR
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 198,000 MILES
Got a system too rich bank 1 code. I changed the spark plugs and coil packs, changed the mass air flow sensor, changed MAP sensor, changed the 2 oxygen sensors, changed the fuel injectors, cleaned the throttle body. It still stutters and stalls out. I don't know how to perfectly do a vacuum leak test but I'm not even sure that's the problem, hence why I'm posting. Can you point me in the right direction?
Sunday, August 29th, 2021 AT 6:25 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

Based on that code, you are getting too much fuel to the engine. In this case, it wouldn't be a vacuum leak. A vacuum leak would allow unmetered air to enter the engine and create a lean mixture. This code can be caused by several things. However, here is a link that shows how to test for a vacuum leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Have you checked fuel pressure? Is this the only code present? If you have a live data scan tool, could you let me know the short-term fuel trims?

Make sure there are no restrictions in the air intake tube/air filter box. Also, check fuel pressure. Here is a link that shows how it's done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

I attached the manufacturer's pressure specifications below. Do this and let me know what you find.

Take care,

Joe

See pic below.
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Monday, August 30th, 2021 AT 7:20 PM

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