Vee Emissions MOT Failure HELP PLEASE?

[J4 WYB]

Hi,

Just had the vee in for an MOT and it failed the emissions test twice:

1st Test:

CO- 0 - PASS
HC- 0 - PASS
Lambda- 1.088 (Limits are 0.970- 1.030)- FAIL

2nd Test:

CO- 0 - PASS
HC- 0 - PASS
Lambda- 1.046 (Limits are 0.970- 1.030)- FAIL

The lambda sensors appear fine as did a fault read last week and no codes or warning lights on dash.

Car has Quicksilver Sports exhaust and BMC CDA but that shouldnt affect it according to reading a few posts on here.

Any help/ ideas very much appreciated

James

 

[Craig]

my 182 failed its mot on emission really bad but no fault would come up. so they changed one of the lambda sensors and it passed

 

[J4 WYB]

ah ok, only issue is I have 4 lambda sensors and all are hard to get to lol
should be fun!
Lambdas for the vee are £185 each

 

[Mark One]

It will be the lambdas. You will get a small performance increase with new ones though

It's a shame your unable to tell which one(s), not sure I can help there.
Shop around for the sensors though. on 1*2s, the upstream sensor is over £100 some places and £55 ish in other shops.
I found Central Auto SUpplies good.
I found NGK make a really good sensor, the tip comes protected in the box, the threads have copper slip applied and it worked a treat on my valver.
http://www.cliosport.net/forum/showthread.php?t=314560&highlight=FAO+everyone+lambda

 

[Mike@Rentech]

I recon you have a very small exhaust leak from one of the clamps by that reading.

 

[SBV116]

I recon you have a very small exhaust leak from one of the clamps by that reading.

First port of call! Make sure there are absolutely no signs of leak anywhere! the smallest leak can fcuk up the lambda reading!:dapprove:

 

[J4 WYB]

I recon you have a very small exhaust leak from one of the clamps by that reading.

First port of call! Make sure there are absolutely no signs of leak anywhere! the smallest leak can fcuk up the lambda reading!:dapprove:

Great advice guys, one of the exhaust hangers had fallen off causing a clapm to become loosened, creating a leak.
All fixed now so hopefully MOT will sail through tomorrow

Thanks!

 

[Mark One]

well done. Good thinking. Let us know how it goes.

 

[SBV116]

Everything crossed!!!