View source for 17544/P1136/004406

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== 17544/P1136/004406 - Fuel Trim: Bank 1 (Add): System too Lean ==

==== Possible Solutions ====

* Check Mass Air Flow (MAF) Sensor
* Check Fuel Pressure Regulator
* Check Fuel Pump
* Check Intake/Exhaust System for Leaks
* Check Secondary Air Injection for Leaks
* Check Vacuum Lines for Leaks

==== Special Notes ====

* [[Fuel Trim Info]]
* When this fault is stored and external vacuum leaks are not found, less obvious problems may be present:
** Check Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) 
** Check Brake Booster and Hoses
** Check Electric Vacuum Pump ( If Applicable )
** Check Crankcase Ventilation System for faulty components. When the PCV or Crankcase Ventilation System is faulty, vacuum is typically present under the oil cap and misfire faults are common.

[[Category:Fault Codes]]