104000 miles. Check engine light came on. The car lost power and has a hesitation when I apply the gas. Also the car shakes when I just start it until the engine gets hot. Codes PO171 and PO174. These are the O2 sensor codes but I think I have a vacuum leak problem. How can I find the leak and how can I fix it? Please help with advise.
Common fault is leaking gasket on intake manifold towards the back, do you have the following symptoms - uneven idle - sudden cut out on idle but starts up again with no problem?
If so you will find a leak on the inlet manifold. The codes show a leak after the MAF- so this is the area to check. Hope this helps.
SOURCE: DTC'S ARE PO171 AND ENGINE
Jaguar S Type MY 2004:
DTC fault code (EOBD Code): P0171 - Fault location = System too lean, bank 1. (Bank 1 is the right side of the car "V" cylinder block).
Probable cause: Intake / exhaust leak, air system, MAF / VAF sensor, fuel pressure / fuel pump, injector(s), heated oxygen sensor HO2S.
Instructions:
1. Check for air leaks on the intake and exhaust systems. Repair & replace bad pieces if necessary.
2. Check the air system components - harness, connections.
3. Check and replace if necessary MAF / VAF sensor. MAF = Mass Air Flow, VAF = Volume Air Flow, sensor.
4. Check the fuel pressure. Replace the fuel pump and injectors if necessary.
5. Check and replace if necessary the bank 1 heated oxygen sensor HO2S.
SOURCE: 2002 Jaguar - X type - engine light with intermittent cruise ligh
check your cruise control unit first
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