355 5.2 Oxygen sensor lifespan?

I can tell you that 355 eats O2 sensors for breakfast.

 

There is evidence to suggest it can be caused by poor supply voltage. Other makes routinely replace relays responsible for the power supply.

Also Bosch O2s are not in anyway the same quality that
A. They supplied to Ferrari or
B. That they used to supply to us.

Our E55 got a CEL for a slow O2. I got the Bosch number off the old one and replaced it with a Bosch part from Rock Auto. CEL came right back. At the suggestion of a good Mercedes mechanic I got another new one. Same thing. Diagnosed everything else. No sign of any issue outside of the O2. He suggested getting an O2 from Mercedes. I did and it fixed the problem. I told a friend who is automotive engineer and has worked for several car companies. He told me it was really cute that I actually thought the quality of a part from Bosch or anyone else was as good as it is from the dealer. He said OEM manufacturers have much higher QA standards than any of their suppliers for the same parts.
That being said if you go to a Ferrari dealer part counter and get an O2 sensor it probably did not come from Ferrari.

 

Ha anyone tried ditching the Bosch sensors for a NTK sensor? I've thought about it for my 2.7 car. Don't know of a cross reference for a 5.2.

 

My old Bosch parts dealer told me he personally preferred Denso o2 sensors for better durability...

 

If you look it up by application on Rock Auto they will probably give you a few brand choices.

Bosch has gotten so bad I'm pretty ready to just give up on them.

For 2.7 Rock Auto lists NTK, Bosch and Walker. For 5.2 only Bosch.

 

Here is a cross reference for the 2.7. The only one I'd try is the NTK.

Bosch 13309 OEM
Standard Motor Products SG168
CARQUEST 75-1640
CARQUEST 75-2369
BWD OS814
ACDelco 213-1425
NTK 25547