i have a question about a knock sensor for a 02 chevy silverado?

MIKE

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ok about the car it has 149000 miles v8 4.8 ext cab i brought it 2 months ago.

my check engine came on yesterday and i took my truck to autozone to get it checked the guy pluged a machine to it and it read p0332 and he said that it eaither meant 1 of the following,that your engine was having trouble (knocking or pinging)which it is not,knock sensor defective,to check connector and wiring to sensor,or low fuel pressure.


now yesterday i put some 22inch rims and tires on it and when i was leaving the rim shop it was raining hard and i was going down a street that was flooded with water probably about 2 feet and i drove right throw it about and about an hour later thats when my check engine light came on.
is it possable the rims or water messed up my knock sensor or my fuel pressure,and where is the knock sensor located at
 
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