P0171 AUDI – System Too Lean Bank 1

mansoorkhan October 01, 2018

P0171 AUDI – System Too Lean Bank 1


P0171 AUDI – System Too Lean Bank 1

P0171 AUDI Description

This diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model. So this engine code applies to the Following Car Brands
  • Toyota
  • Chevrolet
  • Ford
  • Nissan
  • Honda
  • GMC
  • Dodge
Basically, this means that an oxygen sensor in bank 1 has 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. The P0171 is one of the more common trouble codes.

When is the P0171 code Detected?

When is the P0171 code Detected in Audi the Following Thing Happens
  • Fuel injection system does not operate properly. –
  • The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.)


P0171 Audi Possible Symptoms

Symptoms of this code include the following, although there may be symptoms such as:
  1. Engine Light ON (or Service Engine Soon Warning Light)
  2. Excessive Fuel Consumption
  3. a lack of power
  4. detonation (spark knock)
  5. rough idle
  6. hesitation/surge on acceleration.


P0171 Audi POSSIBLE CAUSES

Following Problems Causes of the Code P0171 in a Audi Model
  1. Intake air leaks
  2. Failed or faulty oxygen sensor (bank 1, sensor 1) 
  3. Ignition misfiring
  4. Faulty fuel injectors
  5. Exhaust leak between engine and first oxygen sensor
  6. Low fuel pressure (possible plugged/dirty fuel filter)
  7. Lack of fuel Faulty
  8. Mass Air Flow (MAF) sensor
  9. Incorrect Positive Crankcase Ventilation (PCV) hose connection

P0171 Audi Possible solutions

A lot of times, cleaning the MAF sensor and finding/fixing vacuum leaks fix the problem. So, possible solutions include:
  1. Clean the MAF sensor. 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
  2. Inspect all vacuum and PCV hoses, replace/repair as required
  3. Inspect all hoses and connections in the air intake system
  4. Inspect and/or test the intake manifold gaskets for leakage
  5. Check for a dirty fuel filter and proper fuel pressure
  6. Ideally you’ll want to monitor short and long term fuel trims using an advanced scan tool
  7. If you have access, you may want to run a smoke test
Also, Read P0171 Ford Fault Code Problem Solution

Diagnosis Tool

P0171 AUDI – System Too Lean Bank 1
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P0171 AUDI – System Too Lean Bank 1




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