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By DRP06
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DRP06 Enthusiast

DRP06

Posted
Posted

Glad to find this site.

Problem: Trailblazer LS '06, 70,000k with the trouble code po171. The code was cleared but returned after a week of everyday driving. O2 senser has been changed.

My buddy asked me to take a look at his trailblazer after he brought into the shop 3 times. Some of the things i will check are vacuum leaks, dirty maf and fuel pressure. What can cause this code on the Trailblazer?

 

Thanks for the help.

DofD Senior Enthusiast

DofD

Posted
Posted

Hi there and welcome to GM Trucks! :D

 

Others more experienced should be able to lend suggestions on your question there.

stadt11 Senior Enthusiast

stadt11

Posted
Posted

Welcome Dan!

 

P0171 OBD-II Trouble Code

Technical DescriptionSystem Too Lean (Bank 1)

 

What does that mean?Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

 

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

 

SymptomsYou will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

 

CausesA code P0171 may mean that one or more of the following has happened:

 

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled

There could be a vacuum leak downstream of the MAF sensor.

Possible SolutionsPossible solutions include:

 

In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling

Inspect all vacuum and PCV hoses, replace if necessary

Check for a dirty fuel filter and proper fuel pressure

 

If cleaning the MAF doesn't do it, I've read that replacing the MAF & resetting the SES fixes the prob.

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