P0171 System too lean bank1

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YvonneYamaha
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Joined: Sat Dec 10, 2016 8:04 pm

P0171 System too lean bank1

Post by YvonneYamaha »

System too lean bank 1. Why the heck mechanic miss out? How mechanic can let go this and said don't worry if the engine light will cone up. Just ignore it. ?
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whitehumh2
CHC Trail SuperGuide
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Joined: Tue Jul 04, 2006 11:47 pm
Location: Lachine, Quebec

Re: P0171 System too lean bank1

Post by whitehumh2 »

I would suggest getting it fixed as this code will eventually cause damage to the catalytic converter.

 

Here is the list of possible causes for that code;

 

A 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 may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor


Read more at: https://www.obd-codes.com/p0171
 
 
 

Copyright OBD-Codes.com

 
<p class="bbc_center">1 - There is a time for everything,

and a season for every activity under the heavens:

3b - a time to tear down and a time to build,

5 - a time to scatter stones and a time to gather them,

Ecclesiastes 3:1,3b&5a
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whitehumh2
CHC Trail SuperGuide
Posts: 4529
Joined: Tue Jul 04, 2006 11:47 pm
Location: Lachine, Quebec

Re: P0171 System too lean bank1

Post by whitehumh2 »

The most common would be an intake gasket leak or exhaust manifold leak on the drivers side.
 
The sensor could also be defective but I suspect it to be more likely a leak.
 
Hope this helps,
 
Kev
<p class="bbc_center">1 - There is a time for everything,

and a season for every activity under the heavens:

3b - a time to tear down and a time to build,

5 - a time to scatter stones and a time to gather them,

Ecclesiastes 3:1,3b&5a
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