2002 Citroen C5 ABS stop light eng management light anti po

Tiny
CARBON UNIT 1
  • MEMBER
  • 2002 CITROEN C5
  • 4 CYL
  • FWD
  • MANUAL
  • 142,000 MILES
Citroen should be ashamed, have definite anti pollution recurrent problem on comp, wont admit it, terribly expensive and difficult to diagnose, ordinary eng interogation will not read citroen computer, ie ask r.A.C a.A.A, disgusting, if you give them a free hand with your check book they might or might not be able to fix it, all you can do is change eloi fluid in rear tank, yes you can do it yourself, change catalitic filter, ie exhaust, or borrow one to substitute, citroen diagnosed mine as a turbo failure, my turbo sucks and blows, no smoke from it, no bearing wear, can get fingers to it, it spins freely, citroen want 1200 pounds plus to change, I dont think it is turbo, as car is ok sometimes and drives normally, I think its an electrical common fault, unlike toyota citroen wont admit it, great cars spoiled by greedy manufacturers making then overly and uneccessarily complex in order to MAXIMISE PROFIT, THE TURBO ON THE C5 IS VERY iNACESSABLE, ANY ONE WHO HAS CHANGED ONE please advise, I come across people with this problem all the time, that is why they have no resale value and are frequently scrapped because of prohibitive repair costs, mines a hdi love it but hate it, shouldnt be this hard to sort out, buy honda in future.
Monday, March 8th, 2010 AT 11:09 AM

1 Reply

Tiny
DAVE H
  • MECHANIC
  • 13,384 POSTS
Diesel Particulate Filters (DPFs) Or Anti polution Filter

Particulates, or soot particles are the most visible of the pollutants emitted from the exhaust of a diesel engine, they consist of large carbon particles with other attached and absorbed chemicals. Particulates in addition to being visible are toxic and carcinogenic, and the smaller particle of less than 10 microns (known as PM10s) can penetrate deep into the lungs causing respiratory problems. With the increased use of diesel engines, the increase in air borne particulates is becoming an increasing environmental issue.

These solid emissions can be effectively reduced by filtration of the exhaust. The most effective and practical method is by using a ceramic filter sustrate, usually silicone carbide with microporus walls. This traps the solid particles and allows the gasses to escape through the wall and is vented into the exhaust outlet.
The collected soot builds up within the filter, which will clog and eventually block resulting in a build up of engine back pressure unless it is removed, which is achieved by a process known as regeneration.
Regeneration is achieved by burning the collected soot within the filter, either actively or passively. In an active system a separate, usually electrical, heat source is applied to raise the temperature to a point where the carbon particles are burnt off to produce CO2. In the passive system the heat of the engine exhaust gas is used in conjunction with a special catalytic coating on the filter to achieve the same result

when the anti pollution light came on! It was simply telling you that the Diesel Particulate Filter (DPF) was almost full of soot and the car needed to be driven for 30 miles or so at 40 - 50 mph or above to burn off the accumulated soot and clear the filter. This is not a fault with the car - simply a feature of cars with a DPF. (I often get asked why you can't simply change the filter rather than wasting fuel going for a long drive to clear it. The answer is, you can. The cost is between  1000/  2000, which makes that drive look suddenly economical).
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Sunday, March 14th, 2010 AT 8:58 AM

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