Having problems with your 1999 Chevrolet S-10 Pickup ?

99blazer s10 trouble codes p171/p174

\015 99blazer s10 trouble codes p171/p174\015 Posted / edited by AnonymousUser on : 16-07-2018

Answers :

P0171 - System Too Lean (Bank 1)
\015\012Basically 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.
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\015\012A code P0171 may mean that one or more of the following has happened:
\015\012
    \015\012
  • 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.
  • \015\012
  • There could be a vacuum leak downstream of the MAF sensor.
\015\012Possible solutions include:
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    \015\012
  • 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
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  • Inspect all vacuum and PCV hoses, replace if necessary
  • \015\012
  • Check for a dirty fuel filter and proper fuel pressure
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\015\012P0174 is identical to P0171, except it indicates the problem exists on Bank 2 as well.
I had p0102, p0171, p0174 on my 1998 v6 blazer, dirty fuel filter was the cause, once replaced everything became normal.
Repair Help & Product Troubleshooting for 1999 Chevrolet S-10 Pickup

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