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SN95 Cobras
02 sensor acting up = MILs?
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<blockquote data-quote="STAMPEDE3" data-source="post: 2055076" data-attributes="member: 9007"><p>Limp mode is real, certain codes put it into limp mode. The O2s are not one of them.</p><p></p><p>On rear O2s and Mils.</p><p> The rear O2 is there to tell if the Cats are working properly. That is their only purpose. This is why you remove the cats the CEL comes on. However with that said let me explain the best I can as how they work.</p><p>For this example I will use round numbers to make it easy to understand. with the first number being the only accurate one.</p><p></p><p></p><p> The rear O2 with a good sensor and properly working cat sends a 400Ma signal to the computer.</p><p> When you remove the cat that signal drops to 200Ma and is now out of range so the CEL comes on.</p><p> Mils simply amplify the 200Ma signal by adding another 200Ma so the computer sees 400Ma and turns the CEL off.</p><p> However, If your rear O2 sensor is BAD and reading low say 100Ma then the Mil will add 200Ma and the computer will only see 300Ma and still be out of range. CEL stays on.</p><p></p><p> This is why some people say my CEL is still on with Mils.</p><p>You must still maintain good O2s for them to work and still it is a hit or miss kind of thing.</p><p>I went with a tune. You can completly turn off the rears and then garrenteed no CEL from the rears.</p></blockquote><p></p>
[QUOTE="STAMPEDE3, post: 2055076, member: 9007"] Limp mode is real, certain codes put it into limp mode. The O2s are not one of them. On rear O2s and Mils. The rear O2 is there to tell if the Cats are working properly. That is their only purpose. This is why you remove the cats the CEL comes on. However with that said let me explain the best I can as how they work. For this example I will use round numbers to make it easy to understand. with the first number being the only accurate one. The rear O2 with a good sensor and properly working cat sends a 400Ma signal to the computer. When you remove the cat that signal drops to 200Ma and is now out of range so the CEL comes on. Mils simply amplify the 200Ma signal by adding another 200Ma so the computer sees 400Ma and turns the CEL off. However, If your rear O2 sensor is BAD and reading low say 100Ma then the Mil will add 200Ma and the computer will only see 300Ma and still be out of range. CEL stays on. This is why some people say my CEL is still on with Mils. You must still maintain good O2s for them to work and still it is a hit or miss kind of thing. I went with a tune. You can completly turn off the rears and then garrenteed no CEL from the rears. [/QUOTE]
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02 sensor acting up = MILs?
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