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Thread: Rover 25 engine check light problems

  1. #1
    Join Date
    Aug 2010
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    8

    Default Rover 25 engine check light problems

    Hi all ,
    I have a rover 25 and reccently my engine check light has illuminated serveral times , ive had a diagnostic check done and a code comes up to do with fuel . However the engine has been checked with computer and shows no faults , also there is no judder or sound that is out of the ordinary . Infact the engine sounds and runs as normal . My last visit to the garage after it illuminated they said no faults showed although the same generic fuel code displayed , but an airconditioning fault showed .......which is funny as i dont have air conditioning ? . They said it could be the ecu which ive check and is very expensive . I wondered if any one else has had similar problems and what did they find was the problem as my garage and myself are just scratching heads at the moment .

    thank you
    Mungo

    ps sorry didnt read sticky thread , its a 02 plate , 1.4 petrol engine
    Last edited by mungo1972; 18-08-10 at 15:04.

  2. #2
    Join Date
    May 2008
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    10,543

    Default

    2 things here. One is that all Rovers show the aircon fault when none is fitted, that is normal.
    Two, find a garage with a proper diagnostic tool as the one you are relying on sounds like a basic OBD one and not Rover specific. We need a proper code with its number to help you. e.g. P0171
    Until you do this the problem could be anything.

  3. #3
    Join Date
    Aug 2010
    Posts
    8

    Default Thanks

    Hi Hometune ,
    Ill get the code and type of computer off the garage then will look for a place with the correct computer . this makes me feel alot better as i thought it could be the ecu as it still could be , but as my garage didnt know that the acu fault shows up cos i have no acu makes me think they dont have the right computer . Thanks again for your advice , been a great help . Just one thing what diagnostic computer would be required for a correct diagnostic ....does it have a name / names ?

    Cheers
    Mungo

  4. #4
    Join Date
    May 2008
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    10,543

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    There are dozens of them out there! Most should read this okay so long as they are not the very basic OBD only type. Your car is OBD compliant and these scanners will show OBD codes which may well help find the problem. However, if you can get one that gives Rover codes, it should be more accurate and if it can read the live data this should find the problem. e.g. if the scanner says 'fuel mixture error' or something as basic, then in live data you can see the values of the sensors. It may just be an oxygen sensor failing so don't assume the worst yet.

  5. #5
    Join Date
    Aug 2010
    Posts
    8

    Default

    Hi hometune ,
    Rang the garage and they said the code is PO 170 , and their computer they was a bit vague on but they said its a scanner . I did watch they with the computer hooked up and was scanning all the valves , injectors etc and it came up with no faults at the time of scan . The code as they said is a fuel code but could be various different reasons to bring this code up . As i said the engine runs fine and appears to be fine but the engine check light illuminates it would appear for no reason . Garage is not sure whats causeing it to light up , so im open to any help/suggestions . They wasnt aware of the fault code for acu comming up as a standard thing if you dont have acu , so thanks for telling me that . Look forward to any help or suggestions you can think of .

    regards
    mungo

  6. #6
    Join Date
    May 2008
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    10,543

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    How did I know it would be this code....
    P0170 is a general code which indicates the ar to fuel mixture is wrong. This is often the hardest to pin down. This is why you need live data on the scanner then you can see what each sensor/component is doing. Here is a list of possibles:
    1. intake leak
    2. fuel pressure
    3. fuel pump
    4. injectors
    5. evaporative emissions canister purge valve
    6. oxygen sensors.
    You can check for air leaks around the inlet manifold with carburettor cleaner or similar. The fuel pressure you will need a gauge. The injectors you will need specialist equipment. The purge valve you can check with a scanner. The oxygen sensors you can see what they are doing in live data.

    If the fault only comes on randomly you may be able to get 'freeze frame data' from an OBD program if it is supported on your car. Or drive it round with the scanner connected, wait till the light comes on and see which component is out of limits. Or find a garage that can do this....

  7. #7
    Join Date
    Aug 2010
    Posts
    8

    Default

    Hi Hometune ,
    Yep you've said pretty much what the garage said , the only things that haven't been done are the carbarette clean which i might just try and driving with the scanner on . which i said was ashame i couldnt keep it hooked up till the light comes on , but the light can take up to 3 days before it comes on . I even watched it come on when i was driving and noticed nothing untoward with engine ,as in no judder or funny sounds . What ever it is i guess it must only be slight problem at this time . The garage said just keep driving with it till something developes , which isnt what you want to hear but the alternative is start replaceing parts and hope you replace the right part .....could prove expensive . Thanks for your help Hometune , if and when i find out what it is ill post it .....was considering asking for the engine check light to be dissabled for now that way i wont be looking for it to light up . thanks for you help though .

    Cheers
    Mungo

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