My son was involved in a minor slow speed (5 mph) fender bender with a 2002 S2000. Impact was on right front bumper of S2002 hitting my son's car. Afterwards the S2000 owner reported a P0336 code & had the crank sensor replaced for $330. Is it reasonable there should be a relationship between a low speed impact only damaging the bumper & a damaged crank sensor? I'm not a mechanic but that doesn't sound quite right. Interested in any pro's opinions on this. Thanks.

 

I would say this is unlikely. That sensor is well hidden and should not have been affected. A wiring harness is a possibility, but not the sensor itself.