Date registered: Dec 2008
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i took pics but havent got them uploaded yet, basically there are 2 white and black boxes about 1.5" across, mounted under the shift cable ends, stand in front of the car, look down on the right hand side and you will see the shifter cables coming to the top of the gearbox. between them is the reversing light switch, and under the plastic arms on the end of the cables away from the switch, are the 2 boxes, these are the gear position sensors, and I think they are monitored by the abs/esp controller on the abs pump, or the mafs ecu itself, as their wiring goes to the abs unit then joins the main harness back to the ecu.
Disconnect the battery.
check the abs plug on the back is not corroded at the pins or dislodged in any way, or any wires chafing on the body, now - with the battery disconnected you could clean the male pins in the plug face with a brass brush for suede shoes...very effective but safe. Blow out dirt removed and re-insert the plug and lock in place (could use petroleum jelly on electrical contacts but oils or grease here can cause bad connections unless contacts are scraper type females)
Important - Reconnect battery AFTER switching the sidelight switch to ON
then reset steering/abs/bas system by turning steering wheel lock to lock twicw with the engine running.
then switch off, put ignition on again but dont start this time, handbrake on, press brake, put into 1st gear, then back to N, release brake, press brake, into reverse gear, back to N, release brake and release handbrake, switch off ignition and apply handbrake, your gear detection should now be reset and clutch biting point re-calibrated on the ACS unit.
Worth trying a full reset anyway, see if it cures the problem.
REMEMBER Turn the sidelights on BEFORE reconnecting the battery so the ecu is protected from surge! (Otherwise its a trip to MB for an expensive reset of the engine management lights...)