Peugeot 308 problems

16
Posted 30th Oct
I have a Peugeot 308 2011 which I bought secondhand. I drove well when test driven however it is now giving me problems. It gives me a "faulty anti-pollution alert", the engine misfires and the fan remains on despite the engine being turned off. Any idea what it could be ? It only has around 90,000 miles on it.
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Isn't that the dpf? The warning alert
I had the same problem a few years back, i cant be 100% sure but i think i had a faulty camshaft sensor, paid about £15 for one but i think there is two of them and its recommended to change both at same time. Also, i changed spark plugs.
Edited by: "SteMoss" 30th Oct
Only a thought. I had a similar issue on my Mazda and it turned out to be my timing chain had stretched.
Take it to a garage for a compression test and a head gasket check.

It could be the head gasket failing.

Also, keep an eye your coolant and water levels to see if they drop (indicating a leak) and check your oil cap for a gunk residue, which could mean a mix of oil and water.
Edited by: "psychedelicrenegade" 30th Oct
The last comment about the fan could be normal
How long ago did you buy it and did you buy it from a dealer or private sale. Just wondering if you have any comeback on the seller.
It could be a simple ECU fault French electrics , or lambda sensor. I’d say more than likely ECU with the fan issue while off because it’s clear it’s not overheating. Can you plug it in and get some further diagnotics you will have more chance then because that’s a pretty generic fault
Edited by: "Dannyrobbo" 30th Oct
I would agree with a dpf fault. Fan will be cooling the dpf and the anti pollution alert sounds like it’s ad-blu related.
psychedelicrenegade30/10/2019 20:04

Take it to a garage for a compression test and a head gasket check.It …Take it to a garage for a compression test and a head gasket check.It could be the head gasket failing.Also, keep an eye your coolant and water levels to see if they drop (indicating a leak) and check your oil cap for a gunk residue, which could mean a mix of oil and water.



This makes sense, a failling head gasket can cause a misfire either due to low compression and or coolant or oil entering a cylinder. the misfire, along with coolant/oil poisoning the catalytic converter will throw an error like this.

Head gasket failures can cause a leak between the cylinder and a coolant passage, or cylinder and oil gallery, or cylinder and both an oil gallery and coolant passage, or just between the oil gallery and coolant system (in this case unlikely as you have a misfire)

Some checks you can do is to check the oil filler cap (as suggested above), another check (with a cold engine) is to remove the coolant filler cap to vent any air in the system, then replace the cap, start the engine and run for 60 seconds, stop the engine and remove the coolant cap again. If there is any amount of pressure released after 60 seconds running then the head/gasket could well be leaking.

Please be aware there are levels of head gasket failure, some are very obvious like oil and water mixing or lots of pressure in the cooling system. In other cases the gasket only leaks with the engine really hot, like in slow traffic conditions.

To further compicate things, sometimes the head gasket is fine, but the cylinder head itself can become porous or develop cracks, this will give you the same symptoms as a leaking head gasket.

My advise would be to find a local garage that know their stuff and have them do some tests, a basic garage test is known as a sniffer test, this tests for the presence of exhaust gases in the coolant, usually costs under £50 and is a quick procedure.

Source: I specialised in head repair and tuning work to the trade directly.
Edited by: "andymagic" 30th Oct
As above Peugeot cars are worse for head gasket going, poor made cars tbh at least old ones are , if your cooling water for radiator brownish colour ? Open the oil cap is there’s is a milky fluid then it’s a major issue , these are sure signs of head gasket

Probably won’t be that, is it diesel ? As some cars fan run after the journey as the dpu brings off the crap , this may be clogged and may need sorting
Like i said earlier its likely its the camshaft sensor, i had the same problems as OP is having and i even have the same car and year reg. i would take a gamble and get the camshaft sensor changed but dont buy cheap copies from ebay etc because they kept on giving me more error messages. Just had a look at my invoice and i paid £26 for one from Pegueot in 2016. Hope that helps.
Sometimes eloy needs refilling, that was 307 diesel though. Although sounds like something a little more serious.
Most likely the dpf is full and it's trying to do a regeneration. It needs a really good run on the motorway. 3rd gear upto about 3-4k revs if you can. Once it's successfully done a regeneration it should be fine but with that sort of mileage it's likely that the dpf might be ready for replacing as it's ash content might be high/full, if that's the case I'd have it removed and professionally cleaned out as opposed to buying an expensive replacement.

If anything is faulty then it won't be able to do a regeneration and will probably put an engine warning light on.

Anyway, First off give it a good thrash on the motorway and hopefully that will help it do it's regeneration. The fans coming on is normal and probably actually a good sign that it's trying to do a regeneration. If the fans are running you should try and avoid turning the engine off and keep driving. Ideally keeping revs between 3-4k on a fast empty road. Then allow the engine to cool down by driving smoothly for a few miles if possible.

It might be running rough simply because it needs a regeneration and the dpf is very full etc.. The anti pollution light on some older cars comes on during regeneration but some manufacturers disabled the light as lots of customers were confused and thought there was a fault when that came on. Most newer cars that light will only come on if the dpf is really full and in desperate need of a regeneration. Basically it's probably failed several regeneration's etc..

Anyway, If it doesn't regenerate then you could get it put on a diagnostics machine and try doing a static regeneration.

I hope that helps.
Edited by: ".MUFC." 30th Oct
Dannyrobbo30/10/2019 20:45

It could be a simple ECU fault French electrics , or lambda sensor. …It could be a simple ECU fault French electrics , or lambda sensor. I’d say more than likely ECU with the fan issue while off because it’s clear it’s not overheating. Can you plug it in and get some further diagnotics you will have more chance then because that’s a pretty generic fault


Yes and french cars can spontaneously combust, I have scars from skin grafts to prove it. Haven’t touched a french car since and won’t.
cmdr_elito31/10/2019 05:46

Yes and french cars can spontaneously combust, I have scars from skin …Yes and french cars can spontaneously combust, I have scars from skin grafts to prove it. Haven’t touched a french car since and won’t.



bloody hell did it just go up while you were driving! Mine didn’t go that badly but I did spend ages chasing faults only to find out the ECU looked like it had been sitting at the bottom of the sea.
Dannyrobbo31/10/2019 06:50

bloody hell did it just go up while you were driving! Mine didn’t go that …bloody hell did it just go up while you were driving! Mine didn’t go that badly but I did spend ages chasing faults only to find out the ECU looked like it had been sitting at the bottom of the sea.


It blew up after I got in it and started it. Lucky was parked on same road as fire station and the hospital!!! Fire brigade pulled me out unconscious and hosed me, was middle of the night had been to see a film in town. Got of lightly really due to leather coat, thick jeans and thick leather shoes.
Edited by: "cmdr_elito" 31st Oct
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