[Pebblefeline]

Hi guys

I hope you all had a good holiday season.

I have a code coming up relating to an ageing o2 sensor downstream of my left catalytic converter.
Po515 left o2 sensor (after twc) ageing po159

I have then had another code pop up a few days later saying the left cat efficiency is insufficient.
0946

Is it likely that a failing o2 sensor is the cause of the ecu thinking the cat isn’t working properly?

Is the sensor replacement an urgent job? Can I wait until the weather is a little better
Can the failed sensor do any damage?

Many thanks
Jae

 

[tony1963tony]

With the downstream sensor failing, I would recommend changing all four. Use a name-brand sensor and not something for $15. That is my suggestion.

You cannot trust the codes until the sensor is reliable. Hope this helps.