o2/Lamda sensor dramas

[crgsea]

Hi guys,

Long time lurker, first time poster!

Recently got myself a 2011 iQ2 1.0, and i love it already. It's such a unique little car and its a total tardis!

Got a few issues to sort and first and foremost is the O2 sensors/lambda sensors. On the way home from collection got an EML, checking shows P0138 voltage high, which is the post-cat sensor. Took it out, gave it a right good clean in contact cleaner and popped it back in. 

Now getting two more codes (obviously...) of P0137, which is low voltage post-cat sensor, and P0171, lean running condition.

(I also briefly got a pre-cat o2 sensor error but that seems to have been a fluke.)

There's no vacuum leaks anywhere that i can see, and i'm skeptical since this particular combination of codes appeared after cleaning the sensor. Anyone else had a similar situation? Would rather not have to buy two O2 sensors....

 

Answers on the postcard!

Thank you!

Craig