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Jaguar 2000 XK8 convertible error codes P0172 and P0175 System Too Rich (Bank 1) and System Too Rich (Bank 2)

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For Jaguar 2000 XK8 convertible error codes:
P0172 - System Too Rich, Bank 1: Probable cause = Intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), HO2S (heated oxygen sensor).
P0175 - System Too Rich, Bank 2: Probable cause = Intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), HO2S (heated oxygen sensor).

Posted on Jul 29, 2010

  • Scott Johnson Jul 29, 2010

    So each commented cause is a different possible reason for the error code? Is there any DIY actions that may be taken?

  • TDISLine
    TDISLine Jul 30, 2010

    Yes, you can take some DIY actions as follows:

    1. Check up the intake manifold throttle if it is not blocked in close position inside throttle body, and also if the throttle can correctly smooth rotating between full open and full close positions. Clean inside the throttle body assembly if necessary.

    2. Verify EVAP canister purge valve for correct working. Clean EVAP canister purge valve if necessary.

    3. Check up fuel pressure in the fuel supply line & rail.

    4. Verify EGR system & clean inside EGR system if necessary.

    5. Check all 8 injectors for leaks! Could be one or more leaking injectors, and therefore fuel mixture (& exhaust gases) too rich!

    6. In the last case could be bad heated oxygen sensors HO2S.

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