Micro buttons intact/click when pressed?
Tried syncing it? Google Vauxhall’s key syncing
Check Fuses 1, 11, 17 & 22
Relay k24 a,b,c & d
All info can be found on google search
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you are best getting the rear axle not the conversion kit
rear axle
https://www.ebay.co.uk/itm/Vauxhall-Corsa-C-Rear-Axle-Beam-Frame-Rear-Discs-1-8-00-06/123983708594?hash=item1cde0141b2:g:CcMAAOSwdvxd1tcG
handbrake cables...
I had the same in my old zafira a it was the head gasket seal had gone
Took the head off & the rubber seal was brittle/broken changed it over & didn’t have a problem again
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You are best off getting a donor car & swapping everything over
Unless you are doing it yourself it’s just not worth it tbh
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replace clean egr valve
replace starter motor
ddint say petrol etc so have a read though this
https://www.vauxhallownersnetwork.co.uk/index.php?threads/corsa-1-3-cdti-hot-start-issue.394679/
passenger side is the power sounder alarm it's standard for the sri versions & the battery in them can go faulty
or you need a multimeter & start pulling fuses till you find the one thats draining it (its called parastitic drain)
video here
[video=youtube;zdIKNnwEjIs]
did you clear the code(s) after fitting the new part?
as above was it a original part (not cheap version)?
only way to test to see if its the coil pack is borrow/buy one & swap it