There are 2 lambda probes on exhaust
One before the muffler - catalyst and one after
Inside counterweight in pipe
I have replaced a lot of both pre and post
Clark's are known for them going bad especially if the unit isn't used much
It builds up condensation on them
Also check wiring to them I've had a few that rubbed against side and chafed wires
Mostly one in counterweight also check the plugs on wiring for any moisture etc
Hope this helps
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