Code 171

Tiny
JLR2671
  • MEMBER
  • 2012 CHEVROLET CRUZE
  • 1.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 106,000 MILES
Check engine light have 171 code. Lean bank 1 changed mass air flow sensor. Which did help but the light came back on still has some hesitation.
Monday, October 8th, 2018 AT 7:28 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi and thanks for using 2CarPros.com.

A lean mixture can be caused by a couple things. First, an engine vacuum leak can cause it. Also, low fuel pressure. With that being said, I need you to check a couple things. First, here is a link that discuss how to check for a vacuum leak. You will need a gauge, but most parts stores will lend you one.

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

Here is a link for checking fuel pump pressure:

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

Here are the pressure specs specific to your vehicle:

FUEL PRESSURE

Fuel Pressure (Key ON, Engine OFF) .................... 250-450 kPa (36-65 PSI)

Should not decrease greater than .................... 34 kPa (5 PSI) in 1 min

Let me know what you find or if you have other questions.

Take care,
Joe
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Monday, October 8th, 2018 AT 7:36 PM

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