One of my 405s has decided to throw what I think could be an expensive wobbly, looks to be an immobiliser problem so don't know if any of you clever folk may have any suggestions.
I've noticed on a few occasions, which became more frequent, the car wouldn't start unless you locked it again, unlocked it then tried again. Sometimes needed two or more tries. I have bypassed/disconnected the keypad immobilisor without any issues, like I do on all my 405s so they start without needing to put any code in.
Wednesday morning it was flat as a pancake, eventually jump started it and left it running for an hour, although the battery light was still on suggesting a battery/alternator issue. This morning it's back to it's old tricks, won't start at all despite numerous attempts at locking/unlocking. I've even re-connected the keypad which seems to work i.e. putting code in turns it from red to green but the car won't start, and sometimes the keypad peeps for 30 seconds on red. Looks to me like the battery draining has had a catastrophic effect on the immobilisor, which was showing signs of playing up anyway.
Spent a fair bit of money on this one too, but getting this looked at could be expensive, I fear.