The most common reason for an ABS fault is dirt and rust building up behind the mounting point of the rear ABS sensors. It pushes them away from the hub, they need to be about 1mm away.

Search on Peugeotforums.com, there are plenty of guides. It just needs a long hex key to remove the sensor and a file and / or wire brush and takes just half an hour.

If your sensors and their gaps are OK then next thing to check is the ABS unit. Its mounted in the front nearside wing, behind wheel arch liner. If the liner is missing or cracked then the unit can get exposed to dirt and crud.

And on two occasions I've found an ABS fault to be down to a dirty fuse in the engine fuse bay.

If this has only happened since you had work done, you need to double check the work, see if they've not reconnected something. Failing that, a BSI reset resets the system and costs nothing (google Peugeot BSI reset).

The "Anti-pollution fault" is a generic error message and can mean literally dozens of things. If yours has gone into limp mode then I'm guessing its a 110bhp model (the 90 doesn't go into limp mode), so you can factor in DPF issues into that too.

You need to get it on a decent diagnostic scanner (I recommend Peugeot Planet) for accurate results. Google "Peugeot Planet owners" to find a fellow Pug owner near to you who has the diagnostic gear and will be cheaper than a garage.

Edited by Gibbo_Wirral on 24/11/2014 at 13:41