Emissions Fail

[morto]

what shoud your emissions be on a 2002 plate c5 2,2hdi mines just failed

[paul.h]

Has it had the exhaust particulate filter (dpf) removed, since the emissions test is for smoke and with the dpf there should not be any ?

 

From the MOT testers manual, reasons for failure on emissions are

 

3. After 6 free accelerations, the mean of the last 3 smoke levels is:

a. for vehicles first used on or after 1 July

2008, more than 1.5m-1 for both

turbocharged and non-turbocharged engines

 

b. for vehicles first used before 1 July 2008:

 

- for a non-turbocharged engine, more

than 2.50m-1

- for turbocharged engines more than

3.00m-1.

 

4. Exhaust emits excessive smoke or vapour of

any colour to an extent likely to obscure the

vision of other road users.

Note:

The criterion is density and not volume

of smoke. The description ‘dense smoke’

includes smoke or vapour which largely

obscures vision.

[Johndouglas]

Does it still have its particle filter? Smoke is increased when it's removed, although an early model should still pass the test. To improve the result, buy a bottle of Fortes or Millers. Have the tank fairly low on fuel and empty the entire bottle into the tank. Go for a drive with plenty of rapid acceleration.

I always take my four vehicles to the same MOT test station, therefore they are always tested on the same Boston machine. The station is some distance away from where I live, consequently they always arrive hot, having been driven down the M23. My own Saxo and C5, besides getting a good dose of additive before the test, they get the occasional dose of Miller's throughout the year, and they always get a good result on the smoke test - usually a fast pass. Daughter's Xsara, on the other hand get's the Millers in the few weeks before the test. Her result is never the same two years running. The past four years have been 2.46; 1.89; 0.64; and just last week a horrifying 2.58 with the 6th rev. Talking to her about it, the only conclusion I can draw for the irregular result is the fact that she often buys her fuel with her groceries from the supermarket  where "every little helps".  :P