Emissions failure

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.
pete12345

pete12345

Well-Known Member
Posts
2,427
Location
Isle Sheppy
Hi not been on for a while car been running fine but failed mot today on emissions lambda it's a 2000 4.6 I have got a nanocom and was wondering where to start any help would be much appreciated
 
First check for fault codes on the Bosch ECU, and fix anything that's required. Then take out the O2 sensors and soak them in carb cleaner for a couple of hours. Blow them out with airline before refitting. New air filter, and reset fuel trims. Then go for a blast down the motorway before getting retest.

If you know the MOT guys well enough, they might do a quick check for you without doing the official re-test.
 
I know it's likely they would have checked, but a small hole in the exhaust can also cause this. Check for leaks when removing the O2 sensors. Also, if they've been in for a long time, it is entirely possible they may break off (like mine did) and/or strip the threads on their way out.

Make sure you can lay hands on replacement set and have a re-threading tool to hand to repair the threads.
 
IMG_1521.JPG IMG_1511.JPG I've plugged in the nano com can't find bosh ecu on it anywhere but got some readings I've I can put pics on here I will going change air filter tomorrow and probley plugs then have look at readings again
 

Attachments

  • IMG_1060.JPG
    IMG_1060.JPG
    407.5 KB · Views: 207
  • IMG_1511.JPG
    IMG_1511.JPG
    201 KB · Views: 181
  • IMG_1518.JPG
    IMG_1518.JPG
    283.2 KB · Views: 177
  • IMG_1519.JPG
    IMG_1519.JPG
    302.3 KB · Views: 179
What was the lambda reading if too lean which is a fail look for leaks on the exhaust system. If too rich how old is the maf sensor?
 
They said the the car was to rich the may sensor is about 2 years old but I think I can test it on the nanocom will test it later and see what readings say just off out for new air filter and plugs frank u for the advice
 
Oh thanks now I understand sorry not that good with these computers yer I've got the right one was looking for the bosh ecu
 
Maybe go for a drive with Nanocom capturing all the Motronic data. Just select the Inputs menu, press record & give it a filename. It should record all the engine ECU values for you.

Then it can be looked at in Excel & graphed to see if the sensors are responding properly. Upload the raw CSV file and others can check it.
 
Thanks for that will have to try download the new update on the nano com 1st as got problem with the down load at the moment but will try to do the drive the wkend
 
Not saying the nanocon module has done it just haven't got the new record software on it will try to get a copy of what's going on onto a ad card then put that data up on here thanks
 
You must log in or register to reply here.

Similar threads

B
P38A [P38] MOT Fail - Emissions
2 3
Replies
53
Views
2K
badfluffy
badfluffy
S
Smelly Emissions on L405 4.4 SDV8?
Replies
12
Views
2K
lynall
L
O
L322 4.2SC misfire after engine rebuild
Replies
15
Views
1K
onebounce
O
oakey
P38A Interested in a P38?
2 3
Replies
47
Views
5K
oakey
oakey
ian mitchell
Sport central locking clicking when car unlocked
Replies
13
Views
1K
ian mitchell
ian mitchell
Back
Top