Question about 2004 Jaguar X-Type

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I have a 2002 jaguar x type and didn't pass the inspection sticker because the check engine light is on. They give me this codes that couse that( P0171b, P0174b)Please tell me what they meant and what I can do tu fix this problem. Thx

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The P0171 n P0174 codes come up when the ECM detects a lean air fuel mixture in the system. This means that there is too much air in the mixture.
This can be caused by one or more of the following:
Vacuum leak between MAF sensor and throttle. Check air duct to intake manifold, make sure the clamp is tight.
Fuel Filter restricted - Replace
Fuel Injector restricted - Service fuel system.
Fuel Pump low output - Check fuel pump pressure
Fuel Pressure Sensor defective - Test.
HO2 sensors faulty = Check sensors and wiring
Exhaust leak (before catalyst) - Check
ECM receiving incorrect signal from one or more of the following sensors: MAF, ECT, IAT, IP, EFT, OR TP SENSORS. - Have them checked.
Good Luck!!! Don't forget to rate this post!!

Posted on Aug 23, 2010

  • mike_stang Jan 28, 2011

    I have the exact same issue. Replaced coil in No. 4 cylinder as well as fouled plug. Ran great for awhile but still a little rough. Check engine light came on again with same code. Dealer diagnosed need for injector system replacement ($1400.00) unless you can do it yourself.



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