Codes P0171 Lean Bank 1 and P0174 Lean Bank 2, Service Traction Control?

Tiny
JK0001
  • MEMBER
  • 2007 SATURN AURA
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
Need a systematic approach to troubleshoot root cause. I don’t want to just throw parts at the problem. I think checking for a vacuum leak is a good place to start. No vacuum diagram under the hood. Can you provide one please? Thanks
Saturday, February 3rd, 2024 AT 8:13 AM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Sure, we handle one problem per thread so you can start a new question for the traction control problem. For the lean mixture codes, typically it can be one of three things, low fuel pressure (bad fuel pump), a vacuum leak or the MAF sensor needs to be replaced.

Please go over this guide to get us started:

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Here is how to test for a vacuum leak, please use this guide when the engine is cold:

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

If no leaks are found let's do a fuel pressure test, this guide can show you how and I have included how to do the test on your car in the images below:

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

Fuel Pressure (Key ON, Engine OFF) .................... 384-425 kPa (56-62 psi)

You can rent a fuel pressure gauge from the auto parts store for cheap or free. If the fuel pressure is okay, I would get a new MAF sensor and swap it out, I know you don't want to throw parts at it, but unless you have a known good sensor to test the GPS of the sensor and cannot tell if the sensor is worn out. Check out the images (below). Please upload pictures or videos in your response to the problem so we can see what's going on.

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Saturday, February 3rd, 2024 AT 10:59 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Anything?
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Friday, May 10th, 2024 AT 4:46 PM

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