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Originally Posted by w0mbat
I bought a Scangauge II a few years ago for my Subaru Forester. Then I think it was $160. I have been very happy with it. The Forester tends to get an error that says the catalytic converter or oxygen sensor after it is faulty. This error can even be caused by a small exhaust leak. It only seems to happen when on a long trip and when it does it disables the cruise control which is really annoying on a long drive. A couple of button pushes and all well again. On top of that the fuel consumption function works very well and gives me a much better idea of the range left than the hopelessly inaccurate fuel gauge. You can set it up to display any four pieces of data you like from the huge number it reads.
Ian
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Can you read the output of the sensor preceeding it (Assuming it is a wideband sensor?) I would hazard a guess at a leak as you said. ANything which might allow it to draw in ambient air will cause the following sensor to read lean.
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AND why an I doing this? Not because it is hard but because it is FUN!
Cheers Peter
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Pretty much sums this sort of stuff up in a nutshell. Why else would people put in a heap of effort trying to sniff CAN messaging out as well for vehicles, it can expose setup and assumptions in the background that the enthusiast owner might make differently.