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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21613
Experience:  BEng hons Mech engineering, in auto industry 22 years
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40 coupe hdi diesel when hot the pollution light comes on then

Customer Question

40 coupe hdi diesel when hot the pollution light comes on then the car won't accelerate but then suddenly accelerates.
This only happens on when travelling at constant 70/80 mph along motorway after about an hours travelling
If general driving along a roads at 50/60 no problem?
Submitted: 3 years ago.
Category: Car
Expert:  Matt replied 3 years ago.
Hello


this may be an issue with the FAP system

In the exhaust is a soot filter known to PSA as a FAP. It runs very hot to burn some of the soot off every few thousand miles. It uses an additive is called Eolys and is stored next to the diesel tank with a computer controlled dosing mechanism.

If you don't drive it long enough, fast enough; then the regeneration process won't commence and the filter will block. Take it for a 40 minute blast down a empty dual carriageway; As you need to maintain above 50mph for around six minutes - that will start the process.

Alternatively; take it to your dealer or Peugeot specialist for a forced regeneration. If it's done more than 50,000 they will probably just fit a new FAP and top up the additive. this will cost £6-800.

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