2008 Peugeot 308 Car sometimes doesn't start

Peugeot 308 Problem
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Penguinfication

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Car sometimes doesn't start
Aug 27, 2019 (5 months ago)
This video shows the issue (ignore the pulsating lights, it's just my phone camera doing that) https://www.youtube.com/watch?v=RVDjcapr0Fw

Every now and then, my car refuses to start. It'll work fine if jump started and then will work for a few days normally.

I was jump started yesterday morning and did 2 medium length drives before I parked up at home. I woke up this morning and my car was having the same issue.

The alternator has been tested & the mechanics also said the battery was fine as far as they could tell.

I was thinking it was maybe an immobiliser issue?

Car details
Car: Peugeot 308
Model Year: 2008
Category: Electrics, ECU, Warnings & Lights
Running Rough, Starting & Power Loss

Recalls: Peugeot 308 Recalls
More: Peugeot 308 Problems
Parts mentioned in this problem
Replies and solutions
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whittingehame
Fixes: 12,234
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Aug 27, 2019 (5 months ago)
" the battery was fine as far as they could tell. " !!!! Surprised the garage dont have a battery load tester which will tell if battery faulty or not for definite . Alternator also needs LOAD testing .Does sound lika battery low or possibly weak cell which will show when load testing .
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paulieone
Fixes: 1,666
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Sep 3, 2019 (5 months ago)
check earth lead and also check the positive connection is good
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