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Definition of check engine code P1688:
Chrysler/Dodge/Jeep:
Internal Fuel injection pump controller failure
Citroen/Peugeot:
Metering Oil Pump Stepping Motor Circuit Malfunction
Fiat:
Motorised throttle(2nd idle learn)
Ford:
Metering Oil Pump Stepping Motor Circuit Malfunction
Mercedes:
Metering Oil Pump Stepping Motor Cont. Circuit
Mini:
Electronic throttle control monitor level 2/3 - MAF calculation
Plymouth:
Internal Fuel Injection Pump Controller Failure