SLOW DOWN light when cold — 2002 360 — Cat ECU’s ?

Seems odd that they are wanting to change both thermocouples and both thermocouple ECUs. It also sounds like they are wanting to use OEM ECUs.

Did they scan for faults? I doubt both ECUs would fail at the same time. Do you have a basic scanner?

Technistrada may have a cheaper solution on the ECUs and it's DIY.

https://technistrada.com/catalytic-temperature-control-station---355-360-456-550-575

 

This might be voltage related - if so, it can be fixed by charging or replacing the battery.

I personally would not spend 5k for replacing approximately 1k of parts, without having a clear diagnosis first.

 

Spend the $1K and change them yourself. Although, I would clear the error code and confirm if they come back, and on which side.

 

If you have a half hour, a 3 digit IQ, a Dollar General socket set, an internet connection, a 15 pack of Keystone, and working hands, you can do it yourself for literally 15% of what the dealer tried to scr...I mean quoted you for.

 

I replaced both computers and both 02 sensors due to that issue...Did myself...I actually bought a set of eliminators for the computer 2 but have not installed them yet. It happened 2 years later and I just replaced the 02 sensors...IT HAPPENS AGAIN IM GETTING A TUNE TO DELETE THE ISSUE lol

 

The same source lists the thermocouples at $49.

 

I’d ask what diagnostic(s) was run to determine that the aforementioned parts are required.

Ask to see the numbers.

 

I would read up on what people had to do when they got the same warning. A ODB II scan tool is pretty useful here and if you are going to second guess what the dealer tells you then you need to arm yourself with some info. Agreed it would be odd for both ECU's to go out at the same time, unless you had some big electrical problem recently. If you had the error codes you could look it up yourself and work to resolve one step at a time and possibly save a lot of money but it will take time.

 

Comment of the year. Thank you

 

I thought it was funny too but then I had a lightning strike power surge at my home with a charger plugged in and fried my drivers side ECU for a gated car and I had to scour the Earth for one that was specific to model year 2003. I think I got the last one available on the planet and it cost me around 3K just for the one part!

I understand there are people who have some skills with ECU's now but I warn of caution when chucking prices around for ECU's. YMMV