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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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Need to solve po172 error code

P0172 - System Too Rich (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0175, and in fact your vehicle may show both codes at the same time. You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.

A code P0172 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak.
* There could be a fuel pressure or delivery problem

Hope this helps; remember to rating this free answer.

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Im getting codes 172 and 175 on a 96 tahoe i reset it and replaced the coolant sensor the codes are back within 70 miles

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