Z3M catalyst

[Nodzed]

It may be snake oil but its worth £15 to try it IMHO

https://www.amazon.co.uk/Cataclean-Catalytic-Converter-Cleaning-Treatment/dp/B002BVXM92/ref=asc_df_B002BVXM92/?tag=googshopuk-21&linkCode=df0&hvadid=231920316197&hvpos=&hvnetw=g&hvrand=3893062004590311857&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9045641&hvtargid=pla-385877860030&psc=1

 

[Knightrider]

How is the car running? I have a similar issue with my coupe, scraping through emissions after a carbon clean the past couple of years. Looked at the price of a new cat from BMW and failed to find any aftermarket alternatives.

Then recently I started getting a flat spot in acceleration at around 3000 rpm - my code reader shows an O2 sensor issue and the live data shows static voltage reading on the bank 2 sensor. I have just ordered new lambda sensors and am hoping that it fixes the acceleration and emissions in time for my MOT in a month.

Might be worth reading codes and checking your lambda sensors before thinking about a new cat....

 

[Peter1450]

Not helping anyone with cat problems,but how do guy’s get an mot on cars that have custom headers that elimate the cats from the system?

 

[Pingu]

Not helping anyone with cat problems,but how do guy’s get an mot on cars that have custom headers that elimate the cats from the system?

I don't think anyone will admit to knowing how this is done .

 

[t-tony]

You have to find a “bent” MOT tester.

Tony.

 

[EstorilBlue]

How is the car running? I have a similar issue with my coupe, scraping through emissions after a carbon clean the past couple of years. Looked at the price of a new cat from BMW and failed to find any aftermarket alternatives.

Then recently I started getting a flat spot in acceleration at around 3000 rpm - my code reader shows an O2 sensor issue and the live data shows static voltage reading on the bank 2 sensor. I have just ordered new lambda sensors and am hoping that it fixes the acceleration and emissions in time for my MOT in a month.

Might be worth reading codes and checking your lambda sensors before thinking about a new cat....

The car appears to run fine but I agree, it's a good idea the check the diagnostics just in case they reveal an issue I'm not aware of. Bearing in mind it's one hell of a lot cheaper to change the Lambda sensors I'm almost certain to do that first.

 

[RoadsterBern]

The lambda sensor in the car isn't the same value as lambda in the MOT machine so I wouldn't get them confused. I would start by looking at air leaks, input and exhaust. The second thing I would look at is temp sensors. Hook up a scanner and see if the temp sensor values make sense, particularly the one on air intake, I would be surprised if the cat is dead with so few km on the vehicle.