|
p112f: Manifold Absolute Pressure to Throttle Angle - Too High (Bank 1)
The fault is recognized when the relationship between the indicated intake manifold pressure and the mass airflow calculated based on throttle-valve angle is not correct.
Potential problem source(s):
-Measured value for intake manifold pressure (absolute) too high
- Check intake system and crankcase for leakage
- Check throttle valve (contamination, carbon deposits, icing)
- Check plug and wiring harness between intake- manifold pressure sensor and DME
- Vacuum leak within induction tract/crankcase
- Incorrect throttle-valve angle
- Pressure sensor defective
- Check plug, wiring harness at electric throttle- valve actuator
- Replace pressure sensor
- Replace throttle valve
p0171: Mixture adaptation, lower speed range: mixture at partial load too lean
The fault is recognized when the mixture is too lean and must be enriched by more than 25-30%, depending on load factor.
Potential problem source(s):
- Oxygen sensor before catalytic converter defective
- Mass-airflow sensor defective
- Defective injectors
- Intake-manifold pressure sensor defective
- Intake-air temperature sensor defective
- Camshaft position sensor defective
- Defect in high-pressure fuel system
- Defect in low-pressure fuel system
- Intake system leaking
- Oil cap not sealing
- Leak in exhaust system
- If additional faults related to the following components are present, process these first:
Pre-catalyst oxygen sensor, mass-airflow sensor, intake-manifold pressure sensor, intake- air temperature sensor, camshaft position sensor, high-pressure fuel system, low-pressure fuel system Check air-induction system for leaks (also checking the following components: Positive crankcase ventilation, oil cap, tank evaporative emissions system)
Sounds like it could be a leak in the new valve cover/gasket or crankcase hose?
|