Code : P1128
Make : VOLKSWAGEN
Description : P1128 VOLKSWAGEN Long Term Fuel Trim B1 System Too Lean
Possible causes :
– Faulty Mass Air Flow (MAF) sensor
– Low fuel pressure
– Vacuum leak on engine
– Faulty HO2S bank 1
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.
