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Re: I kept my old bosh oxygen sensor after I......... Posted by TML [Email] ![]() ![]() ![]() In Reply to: Re: I kept my old bosh oxygen sensor after I........., Dean, Thu, 15 May 2003 06:59:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It's the front sensor that I need, and was getting part numbers for.
Regarding the bad ground theory, I realise you know a lot more about these cars (and cars in general) than I do, but I have doubts about said theory. For one, you once asked Anders for confirmation on this theory, and he pretty much said it was highly unlikely. I could find the link for that, if you never saw the response. For another, I do know a lot about electronics, and using the exhaust pipes to provide a signal ground would be incredibly stupid design, and I have a hard time believing Saab engineers are incredibly stupid. They have four wires on the sensor to use for a heater, and the signal for the sensor, which is more than enough to have a heater wire, ground wire, and a signal wire. There is no need for a separate ground for the heater and the signal. They might even be using two signal wires independent of ground. Lastly, and leastly, I measured the ground resistance on the body of both my O2 sensors back when I first read your posts on the subject (many months, maybe more than a year before I ever got a CE light), and neither of them are continuous to ground (in the range of hundreds of ohms). This is about what I would expect from an electrical connection between a friction fitted, high temperature junction between two exhaust pipes. I have yet to get a CEL for the rear sensor, which has the same resistance to ground as the front one. As I said, I cannot fathom that the Saab engineers would be so incompetent as to use a design such as that under any circumstances, and especially not when a better alternative (use a wire) is so simple and easy.
posted by 142.179.15...
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