I don't quite know what to think about this problem.
Yesterday the MIL came on . The car seemed to drive allright and I did not
notice any degradation in performance.
I did a generic OBDII diagnostic with a laptop interface program/connector
at the OBDII connector and there were no trouble codes stored but the MIL
showed up as illuminated.
I cleared the non existent trouble codes, the MIL went out and I was happy
thinking I was home free.
I started the engine several times and the light stayed off.
This morning the MIL was back on again. This time I got out my Trisco scan
tool and retrieved these MB trouble codes via the 38 pin connector
007 Intake air sensor open circuit
015 Throttle valve pot actual value too low
022 EFP actuator signal in limp home mode
025 02 Sensor signal before Catalytic Converter incorrect
029 O2 Sensor Heater before Cataluytic converter too small current
030 O2 Sensor Heater before Catalytic Converter current too large
033 O2 Sensor Heater after Catalytic Converter current too large
039 Inj Valve cyl 2 shorted to positive
045 Inj Valve cyl 5 shorted to positive
047 Inj Valve cyl 6 shorted to positive
054 Mixture too lean at upper part load, Vacuum leak inj pressure
061 Ignition sys output stage 3 cyl 1 misfire
I checked for codes at the OBDII connector with my lapttop/scantool
interface and there were no DTC's to retrieve.but the MIL was on. The O2
sensor test showed that the system was functioning OK and in closed loop.
Again I cleared the non existen DTC's
and the MIL went off.
Does anyone have a clue regarding what seems to be going on here .
Is the ECU on the way out ? I find it hard to believe that the car can have
all these problems and still run all right.
The car now has 93k miles. The wire harness apears OK. probably has already
been replaced. Anything else to look for?