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Re: Another cat question Posted by Saana88 [Email] ![]() ![]() ![]() In Reply to: Another cat question, Harold, Sat, 23 Aug 2008 10:01:38 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Oxygen sensors don't last the lifetime of the car or the owner unless the car company feels like throwing in "scheduled" maintenance when it is purchased new. If you can get it out of there, change your oxygen sensor. The sensor loses sensitivity over time, typically going out of spec between 60-85k. It may still react and adjust but it's "lazy" and very slow to react and generate a signal. If you notice how your NOx is all over the place, I really think you've been getting lucky. Keep in mind that the oxygen sensor has to react quickly and supply different readings to the LH computer so it can fine-tune the mixture, usually 6-7 times a second.
The only reason the catalyst is on there is to clean up after what the engine computer and oxygen sensor cannot compensate for. The original Saab catalysts are very hardy. Don't replace it unless the steel holding it has rotted away or if the element inside overheats (from running too rich for too long) or cracks. There is significant scrap value to a used catalyst, so don't throw it away.
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