Living in Oz, my car is right hand drive C220 Elegance W202 chassis gasoline auto with 111 series engine.
The instrument cluster is misbehaving in a similar way to others but I don't believe I have read a definite solution to my issue.
When I turn the key to the last position before start, all the diagnostics light come on as usual, but quite often, none of the gauge needles (fuel, temp, oil) register. Then I start the engine, all diagnostics lights go out as normal, the engine fires OK but the Revs does not display any movement.
I can then drive off and still no needles work - but the trip meter and the klms traveled work just fine. No speed, no fuel gauge, or temp working.
When I stop and park the car, switch off engine, all seems normal and no instrument lights issues at shut down.
Often, I can then restart the car right away and find all needles working as they should.
What has been done to date with a mechanic.
1. Tech tools diagnostics plugged in and found these errors - * - Code 049 (mixture too rich etc). * - Code B1748 (connection to ETS control module is short circuit to positive terminal.
Another message on the screen but with no error code said "Instrument Cluster, fuel gauge sensor open circuit".
2. Removed the Instrument cluster from the dash - found no lose connections including earth connections all fine - has part numbers VDO 110.008.736/002 and MB Part No 2025406047 on a white label on the cluster.
3. Have run the engine with the instrument cluster pulled out of the dash with needles not registering and moved the whole cluster around by hand - no changes to fault.
4. OVP relay has been tested including trying one from another identical vehicle - no change.
5. With engine running, have checked the ignition key area for possible faults - all seems fine.
6. We did observe when we turn the key on, and the needles do not respond, the fuel gauge needle actually drops down slightly below the 0 indicator on the fuel gauge and constantly flickers slightly.
When we turn the ignition key off, that fuel gauge needle returns to a position just slightly above the 0 as is its normal position.
There is no consistent pattern to this one. very strange - Hope someone can recommend a solution.
Indications of a failed instrument cluster the likely problem?
As replacement part is cost-prohibitive, and if recommendations from this forum indicate an instrument cluster overhaul, would appreciate who is best to repair or exchange by cluster.
If an exchange, can anyone confirm the instrument cluster is the same for left or right hand drive please or would I be best advised to have mine overhauled?
There are no repair facilities for this issue in Oz.
Can anyone advise if the info at this website regards circuits is correct please?
Hope someone can help.
1995 C220 Elegance (when its going good)
2002 C200K Kompressor - ladies car
1989 300SE - W126 - my favorite