Fault Code Help

OiNK

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Hi,

Could anyone suggest why I may be getting the fault code P0171 - Powertrain - System too Lean (Bank 1)?

Trying to resolve this I have replaced the old, badly worn dipstick with the new revised yellow one and also replaced a cracked hose. I turned off the EML light / fault code, however a few days later the light has just come back on and is starting to drive me insane! The car has also recently been serviced and a compression test was carried out and everything is perfect.

The car drives perfectly fine, although I do notice occasionally that clutching in in first gear coming to a stop sometimes I think the revs hold at around 1500 for a second or two before dropping off to idle normally around 800...

Has anyone dealt with this same code, any ideas for me to check?
 
16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean
Possible Causes
  • Mass Air Flow Sensor (G70) defective
  • Intake System Leak(s)
Possible Solutions
  • Check Mass Air Flow Sensor (G70)
  • Check Fuel Pressure Regulation
  • Check Fuel Pump
  • Check Injectors
  • Check Intake System for Leaks
  • Check Exhaust System for Leaks
  • Check Secondary Air System for Leaks
  • Check Vacuum Pipes for Leaks
    From ross-tech wiki
 

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