Crazy.8

Well obviously this would probably be better to ask on a different forum but i figured some of you RX8Clubbers could help shed some light on this! plus i dont want to have to join a mustang forum .

So my friend has a 2007 Supercharger Mustang GT California Special, he is not a big car guy, its just what his dad bought him and he drives it like its any other car. He has had problems with passing inspection for a few reasons but none that make to much sense to me.

So apparently he has a faulty O2 sensor which is throwing his check engine light off, problem one. Not too big of a deal, i figured dropping in a new O2 sensor would take car of that. The main problem is something going on with him either not having a cat or having problems with his cat.

He failed emissions testing and the shop told him it was because he does not have a catalytic converter, but his exhaust doesnt smell like it should if he were catless. And the Ferrari dealership told him that he has a very small hairline crack in his exhaust, and didnt mention anything about him not having his cats.

So could a faulty O2 sensor be the reason for failing his emissions testing? I thought a faulty O2 sensor will only through off the CEL and not effect emssions but then again im not 100% sure about that.

Any help is greatly apprecaited!

Razz1

hid O2 is fine.

He failed due to lack of Cat

Crazy.8

but why wouldnt his exhaust smell like he is running catless?

dannobre

iTrader: (3)

A piston engine doesn't smell like a rotary ....even catless

He won't pass emissions without a CAT...and obviously a mechanic that has a clue

Crazy.8

Haha yeah I know it won't pass without a cat. Just didn't know it wouldn't smell the same as my cat less rotary

You can always learn something new on here! Thanks.

godesshunter

Chances are he does not have a cat. However if he does, and the o2 sensor has been bad for a long time, the cat could be ruined form the engine burning the wrong AFR for too long.

Mazmart

iTrader: (12)

An odorless exhaust at idle is not specific to a piston powered car or a rotary powered car. It's a matter of tune. You could stand behind our 4 rotor Kudzu race car back in the day without the fuel fumes and dizzying effects. Quite clean.

Back to the problems of the OP: Most modern emission tests rely on DTCs (Diagnostic trouble codes) , the absence of which would provide a passing grade. However, the visual inspection part requires the presence of a converter even if the car was putting out 0 pollutants into our atmosphere without it.

Paul.