emisions and a EAT chip

[h2oyo]

I chip shouldn't affect the emission, as long as you are running high octane gas. I took my 535i all tricked out to the emission test and it passed perfectly. (Many people have the EAT chip when they go to the e-test).

I would suspenct bad cats maybe... The 540i seems to burn cats and O2 sensor rather quickly, good thing that it is easy to change.

Thanks Bruno, I didnt think the chip would cause this. So many people have them and love them it would have come up before now. Do you know if there are good cats and bad cats? I mean is a cat a cat or should I be looking for a special brand etc. I know when I bought the car one of the cats had a large crease in it like something had hit it rather hard. I have also heard a rattle from under the car that I thought was one of the cats.
Thanks
Johan

[Bruno]

Thanks Bruno, I didnt think the chip would cause this. So many people have them and love them it would have come up before now. Do you know if there are good cats and bad cats? I mean is a cat a cat or should I be looking for a special brand etc. I know when I bought the car one of the cats had a large crease in it like something had hit it rather hard. I have also heard a rattle from under the car that I thought was one of the cats.
Thanks
Johan

It is pretty straight forward to change on the 540i, you might also change the O2 sensors while you are at it. Don't forget to order the exhaust gaskets also.

[h2oyo]

Thanks everyone, I will look at changing the cats but being as I do have the stock chip it cant hurt to try that also. The plugs maybe original I dont know so I will change them out also before I go through again. I've wanted to do this but just havent wanted to mess with the AZ heat after work. The car runs great smooth the city mileage is around 16 MPG. I thought that not bad being I drive mostly only in the city. I'll let you know how it turns out.
Thanks
Johan