A friend has a petrol peugeot 307 about 3 year old. The engine warning light has appeared on the dashboard display along with a message reading "anti pollution fault " They can drive the car ok and the performance seems normal but can anyone tell me what can be causing the fault lights ?
"tomm" gurgled happily, sounding much like they were saying:
The fault codes can. Anything else'd be a guess.
Yes, it's the MAF sensor which is in the pipe going from the air filter housing to the engine. Never rely on fault codes from the computer as they can be misleading to unqualified mechanics who only know to look the code up in a book. Experience is what counts and identifying the cause of the error code. The exhaust emissions light can come on if the mass air flow meter is knackered because the engine can't tell how much air and fuel to mix. It ends up pushing more petrol or diesel in than required. The sensors in the exhaust side sense this and report a fault. As it gets worse the performance will die off or acceleration will be nowhere near as good. At some point it will go in to an emergency mode and use up quite a bit of petrol. If it had something simple like a blackened air filter it would be obvious and would probably not clear such a fault. After 3 years the filter wouldn't be clogged up that much anyway although it could look a bit irty due to the dust it filters. The surface area is massive.
If you are going to have a go at fixing the car then I would look at a few hundred pounds. That's what a new MAF sensor is for modern cars as you want a genuine one and not some nasty copy. The MAF only lasts about 3 or 4 years anyway - or at least they have in my cars.
Well it's the most likely culprit, but it could also be either o2 sensor, either the sensor plugs, the cat, an air leak, an exhaust leak , a missing fuel filler cap etc. Getting the codes read will be cheaper than a MAF
Which is why most of them will /guess/ it's the MAF sensor
Hmmm I would sooner rely on fault codes than your "expert" opinion.
IIRC you stated that "The piston probably has a hole in it." in the thread "Running on 3" when the OP in that thread stated the compressions were 150, 150, 142, 140 psi
Sorry, no.
I had an 02 plate 307 SW 2.0 petrol from new which randomly showed this message and had to be reset by the dealer/AA.
Twice it also went into limp home mode whilst showing the message - once on a French motorway. Never got to the bottom of the cause despite much interrogation and parts swapping by several Peugeot dealers and after 12 months and 32,000 miles of aggro persuaded the company to send it back to Leaseplan.
Out of the five Peugeots we've owned this was the only one that gave any major problems. I pity the poor sods who bought it after!
Especially as he hasn't even seen the car, never mind been told the fault code...!
LOL, or should that be COL? :~(
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.