ive got a 2001 xterra. i went off roading with it, after off roading i washed the car along with the engine... after washing the engine the check engine light came on, i drove it to where i live on the way about 50 miles into the trip the engine died, while at 60 MPH. it started back up and drove fine.. i had the codes read at autozone. they said all of my o2 sensors where bad, and my knock sensor... i couldnt understand how all that could have gone bad so they erased the codes... the check engine light has not come back on, but the car still dies occasionaly. last time it died was when i was slowing down using the engine. Once again it started right back up and ran fine.. my car only has 60,000 miles. I think it could be bad gas. any help would be appriciated