Help sourcing Airflow sensor following catalytic converter

[Pocetsize]

Just had a diagnostic due to engine management light. Turns out to be Airflow oxygen sensor following catalytic converter. Can anyone help me to identify which of the two sensors this is! I don't know where the catalytic converter is? Smart 450 2005 0.7. I'm burning hot using more fuel than necessary.

[EmilysDad]

Just had a diagnostic due to engine management light. Turns out to be Airflow oxygen sensor following catalytic converter. Can anyone help me to identify which of the two sensors this is! I don't know where the catalytic converter is? Smart 450 2005 0.7. I'm burning hot using more fuel than necessary.

The cat is part of the exhaust .... just after the manifold. Though I do most jobs on my cars, as it'll probably require heat to remove it I think I'd ask the garage for a price to do it for me.

[TheAlmostInvisibleMan]

I'd change both , the top one (pre-cat) is the one to produce poor MPG if fatigued.


The lower one (post-cat) is just used to monitor the efficiency of the cat.


You may have other issues too though.

[macbut999]

I have a few laying around in garage