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PostPosted: Sat Dec 23, 2017 7:02 pm 
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Location: Wigan, Lancashire
Car Model: 9000 Anni, 9-5s by the score
Just failed the MOT with high CO2. There is a CEL which needs investigating and may be the cause.

How can you check emissions at home inexpensively?
Do garages do Emissions test separate from an MOT?

If I sort the CEL it may not be the cause of the rich running (suggested by MOT Man)

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Last edited by DeeDub8 on Sat Jan 27, 2018 2:45 pm, edited 1 time in total.

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PostPosted: Sat Dec 23, 2017 7:11 pm 
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Location: Queenborough, Kent
Car Model: 9k, 9-5 Aero & a Jaaag
AFAIK normally it'd fail on high CO not CO2. Often caused by a knackered cat, although there are other causes ...

My 9000 failed on CO reading, turns out the exhaust place who replaced the cat may have fitted a race one (100-CEL) as all the tester did was to rev it for a minute or two, then re-test and it passed easily - hence why I think it might be cat related.

I'd imagine the garage would be able to test emissions separately, possibly for a nominal fee.

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PostPosted: Sat Dec 23, 2017 7:27 pm 
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Location: not in a SAAB.
Car Model: One of the first RHD 9-5s
Get the CEL read as some faults will force the ECU to running a safe map which usually means overfuelling. Any garage with emissions test gear will do the test but might cost you £20 or so.

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PostPosted: Sat Dec 23, 2017 8:00 pm 
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Location: Lingfield, Surrey
Car Model: 93 Aero 2.8T cabrio
Just having a CEL on should cause an MOT fail.

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PostPosted: Sat Dec 23, 2017 8:11 pm 
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Car Model: Turbo xx
you can buy an emissions tester for about 100 new ,I needed to set up the co reading on my clan so I bought a second hand one off e-bay ,it was under £30 iirc
works quite well ,a bit of a fiddle and I do not know how accurate it is ,but it worked for me

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PostPosted: Sat Dec 23, 2017 8:21 pm 
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Quad_cam_turbo wrote:
Just having a CEL on should cause an MOT fail.


Nope, doesnt even get a mention. Put the same car through 2 MOTS with CEL showing, had a persistent P1576 (brake pedal switch fault) but its not testable so they dont care.

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PostPosted: Sat Dec 23, 2017 9:57 pm 
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Car Model: '03 9-5 2.3 Vector Auto Estate
I thought a CEL was just an advisory as long as it passed the emissions tests. I have a Gunsons CO analyser, bought second hand for about £25. I use it to check the TR7 before the MOT and keep it around 3-3.5% at idle (its allowed 4.5%). It does seem to vary in comparison with the MOT gear but is normally within 0.5-1%.

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PostPosted: Sun Dec 24, 2017 12:18 am 
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TWSaab wrote:
I have a Gunsons CO analyser, bought second hand for about £25. .



thats the one I have ....

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PostPosted: Sun Dec 24, 2017 1:33 am 
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ylee coyote wrote:
TWSaab wrote:
I have a Gunsons CO analyser, bought second hand for about £25. .

thats the one I have ....

I had the first version of that 30-odd years ago and found it very difficult to get stable results. I thought about getting a more recent one as I've heard they are a lot easier to get a stable reading from. My CSE failed its MOT a couple of weeks ago on high CO (and a couple of non-engine-related things). However, I understand the Gunsons analyser doesn't really have the precision to check the limits of a modern car for MOT.

Last time I had an emissions problem to fix on a 9000, many years ago, I went to an MOT specialist (one who only does MOTs and not repairs) and paid for an emissions test only in order to check that I had cured the problem before taking the car for a re-test. They might have charged £10 a go but I can't really remember now.

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PostPosted: Sun Dec 24, 2017 4:02 am 
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Location: Wigan, Lancashire
Car Model: 9000 Anni, 9-5s by the score
The CEL was mentioned as an aside by Tony (MOT bod) as a possible cause, or needed looking into at least, for the high readings. It may be CO and not CO2, after "fail" I stopped listening.

It's a 200 cell cat from Albert666 and was on last year with no issues. It's just been serviced so the plugs should be OK. I was thinking maybe the DIC and was going to swap between cars to see if the CEL moves with it. If it does I could assume the fuelling would be OK but would like to check before the next test. But finding a garage round here that hasn't shut down till Valentine's day isn't going to be easy.

With the global gorging fest upon us I can do nothing till Wednesday now apart from eBay for Gunsons.

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PostPosted: Sun Dec 24, 2017 7:18 am 
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Location: not in a SAAB.
Car Model: One of the first RHD 9-5s
Just buy a cheap code reader from somewhere. Amazon look like they will be delivering on Wednesday so if you have Prime it will be with you just a quickly. That or somebody near you will have one. Ive got one here but im not sure you are that close although I know you where I am.

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PostPosted: Sun Dec 24, 2017 10:57 am 
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Location: Wigan, Lancashire
Car Model: 9000 Anni, 9-5s by the score
9000Parts wrote:
Just buy a cheap code reader from somewhere. Amazon look like they will be delivering on Wednesday so if you have Prime it will be with you just a quickly. That or somebody near you will have one. Ive got one here but im not sure you are that close although I know you where I am.

I have a code reader (or two) :) With itchy there's a bit of voodoo required to get the right combination of reader and phone working with bluetooth. However, I've just had a thought, can I get the code from the open SID? I've seen a Error Count (or similar) when scrolling through.

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PostPosted: Sun Dec 24, 2017 11:28 am 
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You can only get the first code, look for Fcod then you need to convert it as it wont be in real numbers. If nErr is more than 1 then you have more codes stored but no way of getting at them in OpenSID.

If you can find Fcod, post the number and somebody will either recognise it or convert it for you quick enough. I think its Hex to Decimal as the conversion?

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PostPosted: Sun Dec 24, 2017 11:58 am 
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Hex, as in hexadecimal not voodoo curses, is my day job.

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PostPosted: Tue Dec 26, 2017 3:56 pm 
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BillJ wrote:
ylee coyote wrote:
TWSaab wrote:
I have a Gunsons CO analyser, bought second hand for about £25. .

thats the one I have ....
. However, I understand the Gunsons analyser doesn't really have the precision to check the limits of a modern car for MOT.

.



Probably ,it does take some time to stabilise
However as I was just setting up the idle CO level (my car is 1972 ) so no problems with emissions ....

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PostPosted: Tue Dec 26, 2017 4:13 pm 
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Location: Lingfield, Surrey
Car Model: 93 Aero 2.8T cabrio
Courtesy of the sprouts, the emissions in our household presently would likely fail a few tests...

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PostPosted: Sat Jan 27, 2018 2:44 pm 
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Location: Wigan, Lancashire
Car Model: 9000 Anni, 9-5s by the score
Update: My MOT man offered to check the emissions manually in-between any tests he was doing. One of the benefits of cultivating a long relationship with a good garage. Put the original ECU in and it flew through the emissions by a big margin. Car is now booked in for a full MOT first thing on Tuesday and should easily pass.

The fuelling seems to be ECU (not one of Karl's) related. Now I know that it'll be easy to manage as it only takes but a moment to swap them. I am going to stick labels on them for next year. :)

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