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[MrDJ]

Removed coolant temp sensor lead - found couldn't get to sensor without a ramp so reconnected and now have these codes.

1-5 Coolant temperature sensor Voltage high
3-4 ??
9-3 ??

1-5 fair enough as I have a new sensor anyway but what are the other 2?

[mantagte]

34 is egr solenoid voltage high
93 is immobiliser control module no signal

[MrDJ]

don't know much about cars but googling seems to point to EGR being same area as CTS so ive prob done something

No idea why imob is playing up mind..

[Abiton]

Yeah, connector for EGR very adjacent to where you've been doing battle, and the wiring shares a bit of conduit with the temp sensors' wiring IIRC.

Removing the scuttle may make progress with this job considerably easier, I think. Don't have ours (the missus's) here to have a look I'm afraid.

PS, fill in the Location bit of your profile, someone may be near enough and willing to lend a hand. 

PPS 93 may be cam-sensor related according to info in this link: http://www.vauxhallownersnetwork.co.uk/archive/index.php/t-179882.html  :-/

Again, you may have knocked the connector while reaching over the engine (just at the front of the black 'Ecotec' strip)

[MrDJ]

Knocked a wire off the EGR when messing with coolant temp sensor.

All codes seem to have cleared once put back on - immob code flagging was odd