Mot failed on emmisions, suggestions needed.
Discussion
Exhaust on a vehicle fitted with a diesel particulate filter emits visible smoke of any colour (8.2.2.2 (d))
Exhaust emissions exceed manufacturer's specified limit Plate Value 1.80 Reading 3.65 (8.2.2.2 (a))
My car has failed on these 2 things. Firstly my car is an old banger just for work but I dont want to give up on in it yet. Its a suzuki sx4 1.6 ddis 2008. From what I can find it doesn't have a dpf so can it fail on the first thing. They suggested the high reading was due to only driving 2 miles a day and to buy a reddex diesel cleaner. Do you think this will work? Is there anything else I can try? Or how can I test the emissions before retest. I dont want to have to pay to test again if it fails again.
Exhaust emissions exceed manufacturer's specified limit Plate Value 1.80 Reading 3.65 (8.2.2.2 (a))
My car has failed on these 2 things. Firstly my car is an old banger just for work but I dont want to give up on in it yet. Its a suzuki sx4 1.6 ddis 2008. From what I can find it doesn't have a dpf so can it fail on the first thing. They suggested the high reading was due to only driving 2 miles a day and to buy a reddex diesel cleaner. Do you think this will work? Is there anything else I can try? Or how can I test the emissions before retest. I dont want to have to pay to test again if it fails again.
Possibly EGR and inlet manifold coked up, possiblethe EGR is so coked its not functioning correctly ie allowing regen gasses to enter continually, no doubt you've changed the air filter already and checked all engine and crankase breathers,
Strong solution of injector cleaner, then a serious thrashing, i usually use Forte, might be worth sticking two bottles through, i usually stick half of one bottle directly into the fuel filter anyway and the rest in half a tank max, you'll need more than a handful of miles for the cleaner to have any effect.
When i had emission issues, after cleaning out the EGR and inlet i asked the lads at the MOT station if they could just check the readings, had to mince about for an hour till they could fit me in but an easy pass, they weren't going to charge me for that but i always give them a drink if they've helped me out.
Strong solution of injector cleaner, then a serious thrashing, i usually use Forte, might be worth sticking two bottles through, i usually stick half of one bottle directly into the fuel filter anyway and the rest in half a tank max, you'll need more than a handful of miles for the cleaner to have any effect.
When i had emission issues, after cleaning out the EGR and inlet i asked the lads at the MOT station if they could just check the readings, had to mince about for an hour till they could fit me in but an easy pass, they weren't going to charge me for that but i always give them a drink if they've helped me out.
Aaronlm said:
Exhaust on a vehicle fitted with a diesel particulate filter emits visible smoke of any colour (8.2.2.2 (d))
Exhaust emissions exceed manufacturer's specified limit Plate Value 1.80 Reading 3.65 (8.2.2.2 (a))
My car has failed on these 2 things. Firstly my car is an old banger just for work but I dont want to give up on in it yet. Its a suzuki sx4 1.6 ddis 2008. From what I can find it doesn't have a dpf so can it fail on the first thing. They suggested the high reading was due to only driving 2 miles a day and to buy a reddex diesel cleaner. Do you think this will work? Is there anything else I can try? Or how can I test the emissions before retest. I dont want to have to pay to test again if it fails again.
Isn't a retest free if it's within ten days?Exhaust emissions exceed manufacturer's specified limit Plate Value 1.80 Reading 3.65 (8.2.2.2 (a))
My car has failed on these 2 things. Firstly my car is an old banger just for work but I dont want to give up on in it yet. Its a suzuki sx4 1.6 ddis 2008. From what I can find it doesn't have a dpf so can it fail on the first thing. They suggested the high reading was due to only driving 2 miles a day and to buy a reddex diesel cleaner. Do you think this will work? Is there anything else I can try? Or how can I test the emissions before retest. I dont want to have to pay to test again if it fails again.
Super Sonic said:
Aaronlm said:
Exhaust on a vehicle fitted with a diesel particulate filter emits visible smoke of any colour (8.2.2.2 (d))
Exhaust emissions exceed manufacturer's specified limit Plate Value 1.80 Reading 3.65 (8.2.2.2 (a))
My car has failed on these 2 things. Firstly my car is an old banger just for work but I dont want to give up on in it yet. Its a suzuki sx4 1.6 ddis 2008. From what I can find it doesn't have a dpf so can it fail on the first thing. They suggested the high reading was due to only driving 2 miles a day and to buy a reddex diesel cleaner. Do you think this will work? Is there anything else I can try? Or how can I test the emissions before retest. I dont want to have to pay to test again if it fails again.
Isn't a retest free if it's within ten days?Exhaust emissions exceed manufacturer's specified limit Plate Value 1.80 Reading 3.65 (8.2.2.2 (a))
My car has failed on these 2 things. Firstly my car is an old banger just for work but I dont want to give up on in it yet. Its a suzuki sx4 1.6 ddis 2008. From what I can find it doesn't have a dpf so can it fail on the first thing. They suggested the high reading was due to only driving 2 miles a day and to buy a reddex diesel cleaner. Do you think this will work? Is there anything else I can try? Or how can I test the emissions before retest. I dont want to have to pay to test again if it fails again.
E-bmw said:
Super Sonic said:
Aaronlm said:
Exhaust on a vehicle fitted with a diesel particulate filter emits visible smoke of any colour (8.2.2.2 (d))
Exhaust emissions exceed manufacturer's specified limit Plate Value 1.80 Reading 3.65 (8.2.2.2 (a))
My car has failed on these 2 things. Firstly my car is an old banger just for work but I dont want to give up on in it yet. Its a suzuki sx4 1.6 ddis 2008. From what I can find it doesn't have a dpf so can it fail on the first thing. They suggested the high reading was due to only driving 2 miles a day and to buy a reddex diesel cleaner. Do you think this will work? Is there anything else I can try? Or how can I test the emissions before retest. I dont want to have to pay to test again if it fails again.
Isn't a retest free if it's within ten days?Exhaust emissions exceed manufacturer's specified limit Plate Value 1.80 Reading 3.65 (8.2.2.2 (a))
My car has failed on these 2 things. Firstly my car is an old banger just for work but I dont want to give up on in it yet. Its a suzuki sx4 1.6 ddis 2008. From what I can find it doesn't have a dpf so can it fail on the first thing. They suggested the high reading was due to only driving 2 miles a day and to buy a reddex diesel cleaner. Do you think this will work? Is there anything else I can try? Or how can I test the emissions before retest. I dont want to have to pay to test again if it fails again.
"Where a vehicle is left at the testing station for repair and is retested before the end of 10 working days following
the day of the initial failure, then only a partial retest is needed for which no fee may be charged.
Where a vehicle is removed from the testing station for repair and returned for retest within 10 working days
following the day of the initial failure, then only a partial retest is needed and a partial retest fee may be charged.
Retests and Appeals
Only one Partial Re-Examination is permissible per full examination"
Bit late to this, but a couple of things from the DVSA inspection manual that might help with the retest, on top of the "give it a good run" advice, which is right.
The DPF item. That check only applies to cars fitted with a DPF. From what I can find, the 1.6 DDiS in the SX4 is the PSA 1.6 HDi, and the engine type usually listed for it (9HX) is the version without a filter. It's worth looking at the engine code on the block, or asking a Suzuki dealer to check from the VIN. If it really has no DPF, ask the test centre about that item before the retest.
The smoke test itself. The manual says the engine has to be at least 80C, measured with an oil temperature probe, and that idling it in the bay isn't normally enough to warm it up. So a 2 mile trip to the test centre won't get it there. Give it a proper 20 to 30 minute run, ideally with some motorway or dual carriageway, and drive it straight into the bay.
How it's scored. The tester does up to 6 full-throttle revs and it passes if any 3 in a row average at or below the limit. The retest has to use the same plate value (1.80), so you need to get under that. At 3.65 you're about double, which is more than a cleaner on its own usually fixes. Before you go back I'd check:
- air filter, and that the intake isn't collapsed or blocked
- the EGR valve and inlet, as Smint said. A sticking EGR valve on a short-trip diesel is a common cause of smoke
- injectors, if it's ever smoky on the road as well as on the test
On the retest fee: GOV.UK says it's a free partial retest if you leave the car at the centre for the repair and it's retested within 10 working days. If you take it away and bring it back within 10 working days, they can charge a partial retest fee. Emissions isn't on the list of items that get a free retest if you go back by the end of the next working day.
The DPF item. That check only applies to cars fitted with a DPF. From what I can find, the 1.6 DDiS in the SX4 is the PSA 1.6 HDi, and the engine type usually listed for it (9HX) is the version without a filter. It's worth looking at the engine code on the block, or asking a Suzuki dealer to check from the VIN. If it really has no DPF, ask the test centre about that item before the retest.
The smoke test itself. The manual says the engine has to be at least 80C, measured with an oil temperature probe, and that idling it in the bay isn't normally enough to warm it up. So a 2 mile trip to the test centre won't get it there. Give it a proper 20 to 30 minute run, ideally with some motorway or dual carriageway, and drive it straight into the bay.
How it's scored. The tester does up to 6 full-throttle revs and it passes if any 3 in a row average at or below the limit. The retest has to use the same plate value (1.80), so you need to get under that. At 3.65 you're about double, which is more than a cleaner on its own usually fixes. Before you go back I'd check:
- air filter, and that the intake isn't collapsed or blocked
- the EGR valve and inlet, as Smint said. A sticking EGR valve on a short-trip diesel is a common cause of smoke
- injectors, if it's ever smoky on the road as well as on the test
On the retest fee: GOV.UK says it's a free partial retest if you leave the car at the centre for the repair and it's retested within 10 working days. If you take it away and bring it back within 10 working days, they can charge a partial retest fee. Emissions isn't on the list of items that get a free retest if you go back by the end of the next working day.
You've had most of the info but theres another thing to note.
They get your limits off the sticker in your car, if the sticker is damaged or missing then they revert to a standard number.
Pre 1st July 2008 turbocharged is 3.0, post then is 1.5.
My 02 plate Audi A4 was plated at 1.25, it failed one year but only just. That bit of the sticker got damaged on the way back to the test centre and all of a sudden it was now tested as below 3.0.
You need to play the system, they set the rules.
They get your limits off the sticker in your car, if the sticker is damaged or missing then they revert to a standard number.
Pre 1st July 2008 turbocharged is 3.0, post then is 1.5.
My 02 plate Audi A4 was plated at 1.25, it failed one year but only just. That bit of the sticker got damaged on the way back to the test centre and all of a sudden it was now tested as below 3.0.
You need to play the system, they set the rules.
RacingStripes said:
You've had most of the info but theres another thing to note.
They get your limits off the sticker in your car, if the sticker is damaged or missing then they revert to a standard number.
Pre 1st July 2008 turbocharged is 3.0, post then is 1.5.
My 02 plate Audi A4 was plated at 1.25, it failed one year but only just. That bit of the sticker got damaged on the way back to the test centre and all of a sudden it was now tested as below 3.0.
You need to play the system, they set the rules.
Are you sure, when I have seen the tests performed the computer takes you through the test step by step and the info is taken from the vin number. The machine has a an OBD plugged in to check the temps and revs etc are done correctly. I would assume this is the same for every test center.They get your limits off the sticker in your car, if the sticker is damaged or missing then they revert to a standard number.
Pre 1st July 2008 turbocharged is 3.0, post then is 1.5.
My 02 plate Audi A4 was plated at 1.25, it failed one year but only just. That bit of the sticker got damaged on the way back to the test centre and all of a sudden it was now tested as below 3.0.
You need to play the system, they set the rules.
I may be wrong though.
ARH said:
Are you sure, when I have seen the tests performed the computer takes you through the test step by step and the info is taken from the vin number. The machine has a an OBD plugged in to check the temps and revs etc are done correctly. I would assume this is the same for every test center.
I may be wrong though.
The MOT book states the level must be taken from the manufacturers plate and it not available then use the standard values.I may be wrong though.
I thought it mental that the standard value was 3.0 for my A4 yet on the plate it was 1.25 and it still had to beat that having done 350k miles
RacingStripes said:
You've had most of the info but theres another thing to note.
They get your limits off the sticker in your car, if the sticker is damaged or missing then they revert to a standard number.
Pre 1st July 2008 turbocharged is 3.0, post then is 1.5.
My 02 plate Audi A4 was plated at 1.25, it failed one year but only just. That bit of the sticker got damaged on the way back to the test centre and all of a sudden it was now tested as below 3.0.
You need to play the system, they set the rules.
That was where i came unstuck, my 2005 Landcruiser LC5 had no DPF and the sticker had vanished, but it was always tested at 1.5 which presumably came up as the max reading when the reg was entered. Every year was a struggle until i cleaned the EGR and intake, after that it flew through every time.They get your limits off the sticker in your car, if the sticker is damaged or missing then they revert to a standard number.
Pre 1st July 2008 turbocharged is 3.0, post then is 1.5.
My 02 plate Audi A4 was plated at 1.25, it failed one year but only just. That bit of the sticker got damaged on the way back to the test centre and all of a sudden it was now tested as below 3.0.
You need to play the system, they set the rules.
Smint said:
That was where i came unstuck, my 2005 Landcruiser LC5 had no DPF and the sticker had vanished, but it was always tested at 1.5 which presumably came up as the max reading when the reg was entered. Every year was a struggle until i cleaned the EGR and intake, after that it flew through every time.
I can quite imagine that most enter the reg and look at what the system says. But thats not what the mot direction says to do..Gassing Station | Home Mechanics | Top of Page | What's New | My Stuff