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MOT happiness/emissions question
Posted: Fri Mar 08, 2013 8:34 pm
by NCCMUR
hi lads,
passed her MOT today
advisories for a n/s droplink and n/s track rod end and rear disks (no real concern)
the concern was in relation to the emissions, on the initial test the CO was too high and then the HC were too high,apparantly he dumped in some additive or other to bring the readings down.
the question is whats causing the emissions to be so high,and what needs to be fixed.
1. knackered o2 sensor? (no CEL light coming on on dashboard to indicate fault)
2. knackered cat ?
any ideas fellas?
Posted: Fri Mar 08, 2013 8:41 pm
by Pushki
1. Knackered O2 sensor.
The oxygen sensor in most Honda's has a design life of approx. 8 years.
Although your O2 sensor may not have failed completely, they start to become less efficient with age.
They become "lazy" and do not respond as quickly as when new, this causes rough running and poor fuel economy.
They can also shorten the life of your catalytic converter, which is another expensive item to replace.
So if your Prelude hasn't had a replacement oxygen sensor yet, get one.
Although you can find "generic" sensors much cheaper that do the job, they do not necessarily work as efficiently as the OEM one.
Posted: Fri Mar 08, 2013 8:47 pm
by NCCMUR
from where can i purchase said item?
Posted: Fri Mar 08, 2013 8:58 pm
by Merlin
http://www.ngkpartfinder.co.uk
What were your emissions results?
Posted: Fri Mar 08, 2013 9:08 pm
by NCCMUR
@merlin
So would these results definately confirm a duff o2 sensor?
Posted: Fri Mar 08, 2013 9:28 pm
by Merlin
Yup the first Lambda test was a failure so that is probably a good place to start.
My 5th had an MOT just the other day and it was (slightly different engine):
CO: 0.17% (pass is <0.20%)
HC: 22ppm (pass is <200)
Lambda: 0.996 (pass is 0.97 - 1.03)
Posted: Fri Mar 08, 2013 9:32 pm
by NCCMUR
i just missed the one you had for sale too
I looked at the ngk partfinder page but i cant see a price
Posted: Fri Mar 08, 2013 9:34 pm
by Pushki
NCCMUR wrote:I looked at the ngk partfinder page but i cant see a price
They're approx £60 new, give or take.
I got mine from
RockAuto in the US.
Posted: Fri Mar 08, 2013 9:34 pm
by Merlin
The first link I posted above was £56 on Amazon
The 97-98 only one.
Posted: Fri Mar 08, 2013 9:36 pm
by NCCMUR
Ok cheers guys its on my to do list