Hi friends, I wonder if anyone can help me. I have a CLK 200 and keep
getting the engine management light on with the computer reading "Open
Circuit P0130 Oxygen Sensor Upstream" I have changed the Oxygen sensor
and even the Air mass sensor and it still comes back after a day or 2.
I have niticed that it comes on when going around a bend and once when
I went over a bump. I have sat in the car on a ramp while my mechanic
shakes and moves wires and it doesn't happen then, he also wiggled all
of the vacuum tubes for the EGR and tubing for induction system while
the engine was running as well. After a reset the light comes back on a
couple of days later. It's cost me a fortune and is driving me mad,
does anyone have any ideas ? Many thanks. Steve
P.S I have posted this before and had no luck, I'm desperate and I hope you
don't mind me asking again.
Well the bad news is we tried all the options and even found and welded a
tiny hole in the exhaust but the light came on again today. It's driving me
mad as you can imagine, don;t know what to try next. Thanks for all your
help guys. I'm hoping someone else has anything that might solve this.
It looks like you have a random contact in the wire harness on the
circuit of the oxygen sensor. You need to VERY carefully check wires for
any kind of abrasion, burning or any other kind of mechanical or thermal
aggression. It's usually a very difficult thing to sort out, because it
You can also try spray a very good electronic contact cleaner on all the
involved contacts, i.e. on oxygen sensor, on corresponding black box
Ooooommmmm... do it in a very relaxed, quiet and comfortable situation.
And be patient. It'll take time.
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