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Q: Can fuel from certain gas stations cause a engine light to come on ? on 2003 Chevrolet Avalanche 1500

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Replaced both kock sensors a one year ago. Now having a problem with engine light coming on (knock sensor low voltage input) when I fill up at certain gas stations. Light stays on until next fill up, then goes out after a few miles on the new tank of gas.
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i guess anything is possible. yes gas could be water down.try a higher octane fuel like 89 instead of 87 that might help
Yes, bought Cheap gas several times . After awhile smelled like sulfer, rotten eggs, light came on. Filled tank with high octane gas twice light went off. Did not use that gas again and had no problems.
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