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I'm not really certain of an answer for this one, but my guess is a long time. The only side effects I can imagine are poor gas mileage, and more emissions, which means you won't pass an emissions test. If these are no consequence, then you should be able to drive it for a long time without mechanical damage, but I'm not really sure. My EGR valve ( part of the exhaust system) went on my 2000 tracker and I drove for approx. 300 miles before repairiong it and all I got was lousy gas mileage. Sorry I couldn't be more definite

I have been a technician for approx 34 years. As far as I know bad exhaust gas oxygen sensor or heated exhaust gas oxygen sensor (EGO or HEGO) can cause some problems if it is "stuck" on lean will cause engine to run rich and damage the expensive catlyst convertor short term or if stuck on rich will cause engine to run too lean causing convertor overheat possible fire and convertor damage. I have seen convertors with this problem becomeing glowing orange hot with damage to floor carpets ect ect. A careful assessment of problem would be a good idea.

The EGO,HEGO is the last read of the computer and many things can cause a code, from a dirty air filter to small vaccumn leak (cracked hose ect) on some systems like BMW it can be activated by the dipstick not being properly seated

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โˆ™ 2011-10-20 15:52:29
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Q: Check engine light on scanned and found 02 sensor is faulty can't afford replacement at this time how long can you drive like this 2001 Chevy tracker?
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