So now DPF removals are a failure then?.

The DPF isn't a catalytic converter though?

My diesel Octavia has both a DPF and a catalytic converter.

I can therefore remove in its entirety or simply gut out the insides of the DPF, and as long as the cat remains all will be well?

(assuming of course it passes the diesel smoke test).

Edited 21 March, 201313 yr by silver1011

That is highly suspect and if it it went to appeal VOSA will find in favour of the vehicle presenter. The method of inspection is:

On vehicles that qualify for a full cat emissions test, check the presence of the catalytic converter.

Diesels do not have a cat emissions test, they have a smoke test which is carried out in a totally different way.

I'm guessing they didn't fail it on the emissions, more the fact that the cat wasn't physically in place?

The DPF isn't a catalytic converter though?

My diesel Octavia has both a DPF and a catalytic converter.

I can therefore remove in its entirety or simply gut out the insides of the DPF, and as long as the cat remains all will be well?

(assuming of course it passes the diesel smoke test).

I know the DPF isn't a Catalytic converter but when it was mentioned a decatted Passat had failed I couldn't think what else they meant apart from the DPF. I didn't realise there was a DPF and a Cat on our PD's.

I'm a little worried about the speedometer bit.......given that old landrovers speedo's tend to not kick in till about 30mph......

Also, how will they check this? Take it out for a spin? Are garages therefore going to ask me to sign when taking a car in to authorise them to drive my car on the public highway? What about any damages/accidents as a result of their driving it?

They have to take a Land Rover out to test the brakes with the Tapley meter, so they will check it then.

I'm guessing they didn't fail it on the emissions, more the fact that the cat wasn't physically in place?

But the cat should only be checked physically if its a car that has to have a full emissions test (IE a petrol).

I thought a modification the emissions system is cause for a fail?

Having 3 cats, I don't know where I'd stand on removing one or more of them either. :wonder: Assume it's a fail though.

Yeah, on a petrol. Diesels are not subject to a "full emissions test" so doesnt get check for having a cat. From what I'v read the rules regarding the cat checking havent changed since the last update last year. My fabia was MOT'd and passed, I asked about the cat they said it's a diesel so they dont get checked.

This suggests otherwise (and is what I was basing my post on). Says petrol and diesels can fail for a removed cat. Unless that's outdated?

http://www.motuk.co.uk/manual_710.htm

Either way, as long as they keep passing then

I'm a little worried about the speedometer bit.......given that old landrovers speedo's tend to not kick in till about 30mph......

Also, how will they check this? Take it out for a spin? Are garages therefore going to ask me to sign when taking a car in to authorise them to drive my car on the public highway? What about any damages/accidents as a result of their driving it?

Possibly check for movement while doing braking efficiency tests on rollers...

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Possibly check for movement while doing braking efficiency tests on rollers...

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Permanent four wheel drive vehicles, such as most LR's and Yeti's are only put on rollers where there are four of them, which is rare. Brake testing is done with a Tapley meter placed in the passenger footwell.

(as previously posted)

All the 4wd vehicles here get brake tested on a single pair of rollers. It's low enough speed and duration that nothing blows up.

All my vehicles are 4wd.

Edited 22 March, 201313 yr by Kiwibacon

Permanent four wheel drive vehicles, such as most LR's and Yeti's are only put on rollers where there are four of them, which is rare. Brake testing is done with a Tapley meter placed in the passenger footwell.

(as previously posted)

I was talking about "normal" cars tbh. I'm not old enough for a yeti yet...

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The car will have an inspection underneath so it will probably be fairly obvious if the cat has been removed, I guess some will be down to the testers interpretation of the regulations.

All the 4wd vehicles here get brake tested on a single pair of rollers. It's low enough speed and duration that nothing blows up.

All my vehicles are 4wd.

Mine gets tested in the garage's carpark. I would be very unhappy if they tested it on just front rollers.

To be pedantic, Piaa actually do produce a 100w E-marked bulb, but it is mega expensive.

Never known you to be pedantic before :p :p

I was aware of that one, apparently there's a E-marked 80w available too. I have to wonder how far type-approval goes with "out of the norm" things. I daresay manufacturers have designed the electrics with a specific in mind.......take the Octavia brake lights for example, if the wrong wattage is put in, the light still works but throws an error on the dash. The ECU is looking for a specific resistance from the bulb, I assume this is to ensure the correct bulb is used for technical reasons.

Essentially putting in a 80w or 100w would be putting the car outside it's original design spec. (Forget, just for a moment, the legal aspect) There's a greater loading on the circuit, which could cause a melt, which in turn could cause other parts of the car to malfunction.

Does anyone know if anything is diffrent for imported cars?

A few folk have said mine will pass without a cat (not the emmissions test) as it is jap spec....no idea wether this is true or not

All the 4wd vehicles here get brake tested on a single pair of rollers. It's low enough speed and duration that nothing blows up.

All my vehicles are 4wd.

All the 4wd vehicles here get brake tested on a single pair of rollers. It's low enough speed and duration that nothing blows up.

All my vehicles are 4wd.

We have to test our 4 wheel drive landrovers & trucks on single rollers too,ive been doing this for 15 years now & never had a problem,however most mot stations wont do this & as said use a tapley meter.

Isn't there something about cars fitted with LSD's shouldn't be tested on the brake rollers either?. I seem to remember from my Vectra days that Thorney did a very rare run of 3 ST3000's and one of them had the gearbox f****d because of the MOT brake test.

Quote :

Warning lights

As well as electronic parking brake and electronic stability control warning lights (where fitted) the MOT test will also include checks for the correct function of the following, where fitted;

Headlight main beam warning light

Electronic power steering warning light

Brake fluid level warning light

Seat belt pre-tensioner warning light

Tyre pressure monitor working.

-----------------------------------------------------------------------------------------------------------------------------

I am struggling to see how they can check, the above warning lights without interfering with the car, & i believe that they are not allowed to make changes or interfere with the car that can potentially cause damage.

I believe they are not even allowed to plug into the ODB port, even I dont know if the tyre pressure monitor is actually working.

Quote :

Warning lights

As well as electronic parking brake and electronic stability control warning lights (where fitted) the MOT test will also include checks for the correct function of the following, where fitted;

Headlight main beam warning light

Electronic power steering warning light

Brake fluid level warning light

Seat belt pre-tensioner warning light

Tyre pressure monitor working.

-----------------------------------------------------------------------------------------------------------------------------

I am struggling to see how they can check, the above warning lights without interfering with the car, & i believe that they are not allowed to make changes or interfere with the car that can potentially cause damage.

I believe they are not even allowed to plug into the ODB port, even I dont know if the tyre pressure monitor is actually working.

The lights should come on with ignition and then go off after a set time. If they don't come on it could mean the bulbs have been removed...

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The lights should come on with ignition and then go off after a set time. If they don't come on it could mean the bulbs have been removed...

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That's my understanding too; if $system is known to have been fitted to $model, then an absense of the relevant warning light on "ignition on" is grounds for failure.

This suggests otherwise (and is what I was basing my post on). Says petrol and diesels can fail for a removed cat. Unless that's outdated?

http://www.motuk.co.uk/manual_710.htm

Either way, as long as they keep passing then

I cant see where? Unless I'm being fully blind lol. The only bit I can see it says "on vehicles that qualify for a full emissions test, check the presence of the catalytic converter" Diesels are not subject to a full emissions test.

I cant see where? Unless I'm being fully blind lol. The only bit I can see it says "on vehicles that qualify for a full emissions test, check the presence of the catalytic converter" Diesels are not subject to a full emissions test.

Yes, diesels are not subject to a full cat emissions test, and VOSA have confirmed on numerous occasions that the check for the presence of an exhaust catalyst specifically does not apply to diesels. There is also nothing whatsoever in the MOT rules about DPFs.

Lots of MOT testers are misunderstanding the rules and failing decatted diesels in error, but an appeal to VOSA will overturn the fail.

I cant see where? Unless I'm being fully blind lol. The only bit I can see it says "on vehicles that qualify for a full emissions test, check the presence of the catalytic converter" Diesels are not subject to a full emissions test.

Yeah, my bad!

I read this one, and linked the bit where it said 'This inspection applies to all petrol, diesel and gas powered vehicles.' to the page about removed cats. Sorry!

http://www.motuk.co.uk/manual_720.htm

Mine gets tested in the garage's carpark. I would be very unhappy if they tested it on just front rollers.

If I go to an independent garage without rollers, they test everything with an accelerometer (presumably the Tapley meter referred to). But the places that just do WOF's (our equivalent of the MOT, 6 monthly for most cars) run rollers in the floor.

I was a bit worried about it for my work car which is a viscous 4wd system, but it's been through dozens of times now with no problems. One of my other 4wd's is viscous, it's had no problems. The real full-time-4wd has no problems, the haldex car hasn't been through under my care, but will have with previous owners.

I did see a tip-truck in one day which the owner couldn't get out of 4wd. On the front brake test it was spinning one wheel backwards on the rollers. They eventually found the lever.

Isn't there something about cars fitted with LSD's shouldn't be tested on the brake rollers either?. I seem to remember from my Vectra days that Thorney did a very rare run of 3 ST3000's and one of them had the gearbox f****d because of the MOT brake test.

A locking diff could have issues if there was a big difference in speed between left and right (i.e. a big brake imbalance left to right), clutch pack type LSD should be fine. 4wd cars with torsen centre diffs get put through it with only one end turning at a time.