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 Hi all. I just bought a 2006 Dual Cab 4.0 petrol 4x4 Hilux. It's bringing up an error code for the 1st O2 sensors. The previous owner replaced them with after market ones, but it hasn't fixed it. I've taken it to two mechanics and an exhaust place, in case it was a manifold leak, but nobody has any idea how to fix it. 

Any ideas?

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Based upon what you have reported and the following URL, I would be inclined to have an auto electrician check the wiring, connections and any associated relays etc.



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Read that URL more thoroughly right to the end. Good idea to check your fuses. At least it is something you should be able to easily check before going to an auto electrician.

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Thanks heaps Campbeam. Very very interesting.  I was thinking maybe my next step was going to be take it to an auto electrician so now I definitely will and show him that article.  Thanks for taking the time to reply.

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Have you physically removed them and checked them out, The threads are not smothered in grease ?

A hard to remove oxygen sensor may come out easier with rust penetrating oil, WD 40 and the like.

Tests show that many penetrants not only loosen oxygen sensors, but also poison them.

Oxygen sensors are sensitive to "poisoning" if liquid of any type (that leaves a residue) penetrates the inner platinized surface

of the zirconia cell (the heart of the zirconia type assembly).

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Mainly for the benefit of other members, I previously read an internet post by a USA mechanic who highly recommended using brake fluid for hard to remove oxygen sensors.

Worked a treat for me. Also discovered that my 24mm ring spanner could fit over the connector and that it was worthwhile buying a set of 3 O2 sensor removal sockets.

Located this URL https://mechanics.stackexchange.com/questions/12380/how-to-unscrew-loosen-stuck-o2-sensor

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