[S60 2.0T 2006] ECM-400C - oxygen sensor graph analysis Topic is solved

adrian121 · Post by **adrian121** » 09 Nov 2020, 11:41

Hey guys, I need some help with code pulled from VIDA: ECM-400C Three-way catalytic converter efficiency, bank 1, Signal too high.

1. Check engine light poped up, VIDA said ECM-400C. I cleared the code, car ran as usual.
2. After 50 miles it poped up again.
3. Next step: pulled graphs for front and rear oxygen sensor.

My question is, what could possible go wrong here?

Post by **kallekula** » 09 Nov 2020, 11:48

The o2 sensor. Buy a new one

adrian121 · Post by **adrian121** » 18 Sep 2021, 04:42

It was failed catalytic converter.

Explanation:
Green line (which represents rear oxygen sensor) on chart should be stable (0.6V) when idling and hot motor.

Post by **kallekula** » 29 Sep 2021, 09:00

A catalytic converter shouldn't fail. If it does it's mostly because of some error like running too fat mixture etc. Is your engine in good condition?
Great that you solved it