P1136 AUDI Possible Causes
- Intake air leak
- Faulty O2 sensor
- Faulty mass air flow (MAF) sensor
- O2 sensor harness is open or shorted
- Poor electrical connection in the O2 sensor circuit
How to Fix P1136 AUDI Code?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Check engine light on (or service engine soon warning light)
P1136 AUDI Meaning
This trouble code is stored in the engine control module (ECM) when the ECM is no longer able to control the air-fuel ratio. For proper catalytic converter operation, the ECM must maintain the air-fuel ratio (AFR) at approximately lambda 1; this equals an AFR of 14.7:1 by mass. This is achieved by adjusting the fuel mixture to the required amount to account for slight anomalies under normal operating conditions. However, when a fault causes the fuel compensation to exceed a predetermined level, the malfunction indicator light is turned on and a limited operating strategy is employed. The pre-catalyst exhaust gas oxygen sensor is the main component used to calculate fuel compensation once the system enters closed-loop control. Fuel compensation data can be displayed as a percentage, positive or negative.
This diagnostic trouble code (DTC) can be caused by a faulty mass air flow sensor, fuel pressure regulator, fuel pump, exhaust or intake leaks, secondary air injection leaks, or vacuum leaks. Additionally, any mechanical fault can also cause this DTC. Common failure points associated with this code are a damaged EVAP purge control valve, brake booster and hoses, electric vacuum pump (if applicable), PCV, or a ventilation system.