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  1. #1
    Join Date
    Aug 2017
    Location
    Pleasanton CA USA
    Posts
    368

    Default P2188 System too rich at Idle Bank 1

    My 2004 XC70's engine has been fault-free for the 2 years since I bought it. It's the 5-cyl B5254 T2.

    After filling tank today, upon restart it threw a P2188

    "System too rich at Idle Bank 1".

    I noticed right away that the idle was choppy, almost stalling, then racing, then settling down. Driving home, the choppiness continued at
    stop lights. It's almost as if the throttle is getting whipsawed.

    What does the "too rich" error suggest?

  2. #2
    Join Date
    Feb 2003
    Location
    Dimock, PA
    Posts
    1,559

    Default

    Possible causes include
    – Leaking fuel pressure regulator
    – Leaking fuel injector
    Bill
    63 PV544 (attempted restoration)
    83 245 DL OSD (transferred to son)
    85 240 GL OSD (transferred to son)
    03 XC70 OSD (traded-in 4/12)
    05 AWD S80 OSD (transferred to son)
    12 XC70 T6
    16 S60 T5 Drive-E (FWD)

  3. #3
    Join Date
    Aug 2017
    Location
    Pleasanton CA USA
    Posts
    368

    Default

    Excess fuel injection (flooding) points to a problem regulating fuel injection. The sensor that controls it is the Mass Air Flow (MAF) sensor.

    As a first crack, I cleaned the MAF sensor using a spray MAF sensor cleaner. This has smoothed out the idle, although it seems a bit high in neutral (800-900 RPM).

    Will continue to monitor. I neglected to say the engine has 120,000 miles on it.

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