I have a Peugeot 207 2009 1.6 Diesel that's done about 128,000 miles.
It just passed its MoT today with normal results for emissions.
After about 20 miles (30-70 mph) it lost power and the message "anti
pollution fault" flashed on the display. I was forced to stop, waited a
bit, then restarted.
The ECU warning light is on but performance seems normal. I drove
another 10 miles without issue (except the warning light is still on).
I've Googled the problem and the fault can be caused by a variety of
issues, but I'd like to know if the MoT was just a coincidence or is
there something done in this test that could've caused damage? Ramming a
sensor up the exhaust for example.
Thanks for any comments.
I have a Pug 308 1.6 HDi, so the same engine. I've had it give Anti
Pollution Fault a couple of times. One time it was because a "pouch" of
"additive" (possibly something akin to AdBlue used by buses and HGVs) had
ruptured and so the engine wasn't receiving the additive. That was a couple
of hundred quid to be fixed. The other time was the diesel particulate
filter that had stopped working properly. I did all the normal things, like
running for a while in a lower gear than normal to get the engine revving
fast, in the hope that this would trigger the burning-off of soot which
happens routinely. But this was to no avail, so I had to have a new DPF and
a new cat - the latter because when they removed the DPF, the nut on the new
DPF stripped the thread on the cat as it was being tightened (in fairness,
the cat was of an age where it should have been replaced anyway). That
little lot cost a grand :-(
The same thing happened to be last week: Anti Pollution Fault message and
severe loss of power - it was a struggle to get the car above 40 and that
dropped to about 20 on a long gradual hill. I booked the car into the local
Pug garage, and then something made me look under the bonnet. And I found...
the outlet hose from the turbo to the inlet manifold had come off! It was
about two minutes' work (one of which was finding a screwdriver) to loosen
the jubilee clip, refit the hose and tighten the clip securely. I knew
within about a hundred yards of driving that normal service had been
resumed. I wonder whether the garage may not have properly re-tightened the
hose when they were doing work on the car (a fuel-starvation problem which
needed new glowplugs and a new fuel-pressure sensor) a couple of months
The moral of this last tale is that even after you rectify the fault that is
causing the error, it takes several cycles of start-run-stop before the
warning and engine management light go out spontaneously. So you *might*
find that the fault goes away of its own accord - maybe something they did
during the test triggered the fault and it's taking its time to clear. Or
you may need to get it looked at. I'd suggest using a non-Pug garage first
of all, because they usually charge less for using their diagnostic tool
that plugs into the engine management unit, whereas the Pug garage wanted to
charge me £120 even to diagnose, before they even started to fix. I wonder
whether they would have done that if I'd taken the car in with the hose
detached - it would have been an interesting "gotcha" test for a TV
programme or motoring magazine article to rig a car like this and sort out
the honest from the unscrupulous ;-)
They don't take anything apart.
However there is a warning displayed that they rev the engine and that
sometimes they break (if they haven't been serviced properly?).
I expect that to be mechanical bits not the sensors though.
Well maybe you need to go back and get the thing tested as although
coincidences occur, there are often cause and effect issues involved. Of
course it could be that a plug or sensor is doing daft things. I do not know
what they remove in such tests these days.
This newsgroup posting comes to you directly from...
Apparently they didn't remove anything for the test. As dennis said, all
they do is shove a pipe up its bottom to measure emissions, and rev it a
My local garage has read the codes and there are no sensor faults
logged. They did find the original fault "anti pollution fault" and
another to do with the glow plug relay.
They also said that the turbo hose was so clogged it would have a
Also, the oil and fuel filters need changing as the car has not had a
service for about 35,000 miles (just oil top ups).
Thanks David. I think I will get a code reader - for next time. Do these
devices allow real-time viewing of engine parameters?
Hmm. The hose in question is a very short flexible rubber air intake
hose. It doesn't look like what a new one does.
I was told by the mechanic that it sounded like the engine was
"struggling to breathe".
I now have to consider whether:
a) he was talking truthfully in his opinion, or
b) maybe changing that hose and a full service would make things better.
My other local garage is worse :(
That sounds scary. What is the hose clogged with? I can't imagine anything
large like leaves getting through the turbo, and the air filter should block
dust/dirt, because you really don't want that contaminating the oil film on
the inside of the cylinders. If the output from the turbo to the engine
comes off (as mine did - see earlier in the thread) all manner of crud can
get in. I'm not sure what sequence the turbo and air filter are in relation
to engine - probably air filter - turbo - inlet manifold, to keep crud out
of the turbo as well as the engine, so if the turbo-to-manifold hose comes
off, that's after the filter...
If you have Android smart phone look up the Torque App. The phone/app
can connect directly to a £10 OBD II adapter to provide real time
A random Youtube video
I've been looking at these devices now.
Some units state that they work with Peugeot/Citroen for example, and
they support more functions than straight ODB2 - that's how I read it
anyway. They will also work on any ODB2 system, but apparently have
features specific to that car manufacturer that normal ODB2 tools don't
Would car manufacturers have their own specific protocol that standard
ODB2 units wouldn't be compatible with?
E.g. I have been looking at an iCarsoft i820 and i970. The i820 is a
standard ODB2 unit, whereas the i970 can do ODB2 but also seems to be
I've seen those really cheap bluetooth units. Even one at £2.99! Can
they really be as good as a unit costing £60-100?
I have a bog standard BlueTooth ODB II reader.
It could read most things on my 2001 Fiat Ducato.
It could read very little on my 1996/7 Volvo 850. You needed Volvo
When I read the fora on the Touareg it was pretty obvious that VW have
their own set of fault codes, and there are quite a large number of
"intelligent" devices on the CAN bus which are vehicle or manufacturer
So usually best to get one which has software designed for your specific
If you are trying to save £120 per visit then spending a bit more is often
Also beware of cloned hardware and software. Some software manufacturers
check that the hardware is theirs before allowing it to work, and also
before accepting any software updates. £2.99 suggests that not a lot of
investment was made in the production and even less in support.
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64
£2.99 and over a million people have paid for it.
The OP is not trying to upgrade software just read the codes and any
real time output from the ECU
Torque works with [Quote]
Works on vehicles made by Ford, VW, GM/Vauxhall/Opel, Chrysler,
Mercedes, Volkswagen, Audi, Jaguar, Citroen, Peugoet, Skoda, Kia, Mazda,
Lexus, Subaru, Renault, Mitsubishi, Nissan, Honda, Hyundai, BMW, Toyota,
Seat, Dodge, Jeep, Pontiac and many more vehicle makes, European, US,
Far East, etc. Some vehicle ECUs may support more/less features than others
Try Torque for free and see what you get. The free (lite) version does
all the basic stuff and has over 5 million downloads. Add plugins by the
same author such as Torquescan.
In use when you get a fault code you also get a link into the WWW that
can give you clues to what may be going wrong.
At one time a lot of OBD II information was freely available on the Net
but the car manufactures cracked down on the "illegal" publication of
their data and many of the sites disappeared. This is probably the
reason that main dealers can still charge £100+ for plugging in their
diagnostic equipment to read fault codes.
Not necessarily OBD software, but some of the better software packages
available are actually free to download and use. You can make a
contribution if you wish but it's not compulsory.
If you own a Ford/Mazda then for real time monitoring I recommend
ForScan - again free.
It might be worth buying your own fault code reader.
I would suggest asking around on the Pug forums to find the best one, but
if the main dealer charges £120 just to read the codes this gives you a
budget target to break even on first use.
I am assuming the message is equivalent to the "engine warning light"
which can be triggered by any number of things from a failed sensor to
abnormal readings from a sensor. Gives you a "heads up" on what the engine
thinks is wrong.
I bought an expensive one for my VW and it also highlights things which
don't trigger the warning light, such as aircon sensor failures and GPS
aerial issues. VCDS is over £200 but IMHO worth every penny.
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64
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