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P0142 O2 Sensor Bank 1 Sensor 3

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Old 12-18-2009, 02:36 PM
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P0142 O2 Sensor Bank 1 Sensor 3
Where is this sensor? I think I can see 1 and 2 .. but 3?

This is an '02 C230K with the 2.3L ...



Thanks
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Old 12-18-2009, 02:42 PM
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Bank 1 in OBD2 talk means the side with cylinder 1. Position 3 seems odd, so I am not sure. But typically the upstream O2 sensors give you issues and not the downstream.
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Old 12-18-2009, 02:43 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
There is no sensor 3 on the M111 - wierd???
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Old 12-18-2009, 04:17 PM
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No I'm just an idiot, I think it's actually P0412 ... doh!
Now how to change the subject.
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Old 12-18-2009, 04:51 PM
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Originally Posted by raspeed
No I'm just an idiot, I think it's actually P0412 ... doh!
Now how to change the subject.
P0412 - Secondary Air Injection System Switching Valve A Circuit Malfunction. Sorry can't help on that one, hopefully Glyn will chime in again.
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Old 12-19-2009, 02:19 PM
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thanks... we've had pretty variable weather, lots of moisture above and well below freezing
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Old 12-19-2009, 04:33 PM
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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Hi

See diags - Secondary Air pump & Air injection line & shut off valve 300

You need to troubleshoot this entire arrangement including, air pump, relay & fuse & shut off valve 300 in diagram.



Attached Thumbnails P0142 O2 Sensor Bank 1 Sensor 3-m111-air-pump.gif   P0142 O2 Sensor Bank 1 Sensor 3-m111-air-injection-line-shut-off-valve-300.gif  
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Old 12-19-2009, 07:45 PM
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Thanks, I will report back!
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