405 1.8 GLi Petrol - 'Engine Diagnosis' light

Hi,

the yellow light shaped like an engine with a 'K' in it has started
flickering on and off.

The handbook says 'injection or ignition'.

Firstly, what sensor(s) pick up the problem?

Secondly, what is likely to be the cause (more precisely than the vague
description in the manual)?

I have the car booked in for the 30 minute diagnostic test but would like
some idea of possible causes before the garage starts offering to reduce my
bank balance.

I know that guessing is not easy, just wondering if there was a 'most
common' cause.

TIA
Dave R

--

 

For less than the price for the 30 mins at your pug dealer, you can buy a
pod to download the error memories from your ECU (Halfrauds sell em - made
by Gunsons getthe correct one for your ECU/model combination) The booklet
with the pod will tell you how to decode the fault codes.
After about 20 engine starts after the fault has gone away so download soon
after the flickering starts.
Usually flickering problems are no big deal, continuous orange faults ought
to be dealt with although the car should be driveable still.
If the STOP light comes on then do just that and find out why.

Bob

 

Recently, I've had MAP sensor, throttle position sensor, and idle
control valve. But it could well be anything, and you're really in the
hands of the garage. Let's hope they are honest!!

 

Most of them !

It could be anything - you can't really decide until you know what the fault
code is. Mine came on a few times when I had a split pipe to the MAP
sensor - so check all the vacuum pipes are secure and split-free. I seem to
remember the ECU will flag a fault if it decides the Lambda isn't working
(ie, the Lambda's signal doesn't change in X time).

 

Thanks Bob and others.

Now slightly confused.

Does the yellow light still come on whilst driving after the fault has
cleared, or does the code get stored 20 starts after the yellow light has
flickered for the final time?

Yellow light comes on when ignition is first turned on, but I assumed this
was just to show that the lights were working, as the other warning lights
come on as well.

Booked in for a diagnostic on Saturday - local Halfords don't stock the
diagnostic thingie but I will bear it in mind for future use, and Google for
it as well.

Thanks
Dave R

 

Usually, the light will flash when there is an intermittent fault, and
stay on when there is a permanent fault. When intermittent, if the
fault rights itself, then after a certain amount of driving cycles, or
on earlier cars, 20 ignition on and off cycles, the light will stop
flashing. If the fault is permanent, then the only way to get it off
is to fix the fault and clear the fault code in memory.

 

Diagnostic test was interesting:
[Report is secondhand via Number 1 Daughter]

(1) They aren't sure what the diagnostic code meant and will look into it
further (!)
(2) They seem to have reprogrammed the immobiliser so it won't recognise the
key fob anymore, so they still have the car and we have a courtesy car. Now
awaiting a slot in their busy schedule to fix it.

Perhaps the car is cursed (or perhaps the garage should be)?

Cheers
Dave R

 

I think the garage should be!
[1] There aren't that many codes on the 405 and they are all
documented in their workshop books.
[2] You can't programme the 405 immobiliser. The key is pre programmed
from Peugeot and that is it. God knows what they have done!!