I have a question which may be relevant,
Why do diesel engines need a catalytic converter?
Surely this is an important consideration in all the above replies?

I can understand why petrol engines need one,
Thanks

To remove nasty emissions before the exhaust hits the environment...?

Same reason, just a slightly different type of cat...

So why does my 04 D2a Td5 not have a cat ? Still got the factory exhaust and there's no evidence that it ever has a cat fitted ??

Kev..

Why does my 95 Tdi not have one..

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"Knowledge is knowing that a tomato is a fruit, but Wisdom is knowing not to put it in a fruit salad."

VladTepes' Land Rovers

I have a 2004 D2 td5 and my car has a cat, completely stock.

Whether your vehicle has a cat or not depends on when the emissions regs came in, and how clean the engine is.

As mentioned, commercial vehicles were different from passenger cars. Some of the EFI diesels with high pressure commonrail injection and EGR managed to get their emissions clean enough that they met EURO III standards without much aftertreatment.

The cat is the small round can in the turbo pipe just as it runs under the firewall.
If you have an MY03 onwards, they're EURO3 which are cat systems.
If it's not there, it's been removed.

Cheers

Andrew

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Bonnie - MY03 D2a TD5 Auto (One Bourbon)
Clyde - MY93 RRC 3.9 Classic (One Scotch)
Arfa - S2a 109" custom trailer (One Beer)
Earl - The "Duc" 2009 Ducati Sport Classic (chuck in a Lambrusco)

www.perthrollerderby.com.au

ah maybe im not looking in the right place ? If theres on on a Defender Tdi where would it be ?

__________________
"Knowledge is knowing that a tomato is a fruit, but Wisdom is knowing not to put it in a fruit salad."

VladTepes' Land Rovers

I am sure Tdis dont have oxy-cats.