CBS Autos Nelson Solved MK3.75 non starting

Technical Area Electrics & ICE
1

I was baffled. Four days ago I attempted to enter my 2014 MK3.75 2 litre Sport Tech Recaro using the key fob, the door would not open but I successfully opened the door with the key. Car started 1st time, thereafter it would not start, cranked the engine a couple times, tried the spare key, tried re-locking the doors & unlocking without success in starting the engine.
(Everything surely pointed to the immobiliser, reminded me of my MK2.5 problematic immobiliser a few years ago).
A trip to Carl at CBS Autos Nelson BB9 7BJ 01282 697413 ww.mx5specialists.com
in my trusty Eunos 1.8 S Special.
**Carl’s suggestion disconnect the battery wait a few minutes re-connect
.SUCCESS car started 1st time, 15 mile drive to let the ECU go through its business, SUCCESS.
Simple when one knows how!

Keith

1 Like
2

:ok_hand:

3

Nice one Keith.
If memory serves me right, this issue has come up before, perhaps a year ago on this forum.
Pleased that the solution was very simple.

4

When you say disconnect the battery, was that just the negative lead?

5

Do both and press the brake pedal for 10 secs to drain any current in the system after disconnecting both terminals.

6

I can understand the possible benefit of pressing the brake pedal, but I’m really struggling to understand how disconnecting both battery terminals would be any different to/better than just disconnecting the negative terminal.