P0138 code

172 Views 2 Replies 2 Participants Last post by  KeithyCoop
Our R52 Cooper S has just thrown up the P0138 code which I thought was something to do with the post cat lambda, but my BMW/Mini scanner says before cat.

Anyone got any idea, I had a new pre cat lambda fitted in Dec as a serviceable item, but wondered if I should refit the orginal?

I can’t hear any exhaust leaks, but it needs to go on a ramp for a better check.

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The post sensors are almost redundant, itll be the pre Id bet, stick the original one on and see what it does.
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