Hello, my 970 4S has 60K miles on it, and is up to date with scheduled maintenance. I started to notice higher than usual oil consumption, poor fuel efficiency, and some noticeable power loss. I was getting a check engine light, and if moving into Sport or Sport Plus mode and getting on the gas with any enthusiasm it would go into "reduced engine power" mode.

Took it took an independent Euro shop that has a previously certified Porsche tech (20 plus years at local Porsche dealer) I worked at this dealership in sales a decade ago and know this man well. He had the car for 3 full weeks and explored so many things.

Changed the plugs, checked the injectors, checked the valve springs, the intake ports, etc. Couldn't identify the problem. They were generous in not charging me too much and advised me to take the car to the dealer. The car keeps misfiring in one particular cylinder and has a CAT bank 2 fault.

It was at the dealer for a full week before they touched it (and I still know the owner and several staffers, but it didn't move me up).

They have landed on the drivers side cat needing replaced.

They quoted me $3K parts and labor, the service manager is scrambling to find a reasonable lead time on getting a Porsche cat (could take a month!).

Has anyone experienced this? The auth dealer is willing to install any cat / exhaust I could find myself (minus any guarantee of part)

Is there a better option for me? Should I look to replace the entire exhaust cats included with something sport / aftermarket?

 

Hi. Saw your post and got some thoughts about it:First off, it's great that you took your car to an independent Euro shop that has a certified Porsche tech. It's always good to have someone who knows what they're doing working on your baby. However, it sounds like they couldn't quite figure out the problem. Bummer.

Now, you've taken your car to the dealer and they've identified the issue as a faulty catalytic converter on the driver's side. They've quoted you $3K for parts and labor, which is pretty steep. Plus, they can't even guarantee a reasonable lead time on getting a Porsche cat. Double bummer.

So, what are your options? Well, the dealer is willing to install any cat/exhaust that you can find yourself, but there's no guarantee on the part. If you're feeling adventurous, you could try finding an aftermarket exhaust system that includes new catalytic converters. This could potentially give you some performance gains as well, but keep in mind that it might not be street legal in your area.

Another option is to try and find a used OEM catalytic converter. This could save you some money, but there's always a risk with buying used parts. You never know what kind of condition they're really in.

Ultimately, it's up to you to decide what you want to do. If it were me, I'd probably try and find an aftermarket exhaust system that includes new cats. But, if you're someone who wants to keep their car as close to stock as possible, you might want to stick with the OEM part.

Here.

 

This is where my head goes, any recommendations on a complete system (links would help).