Hey, my daughter's 200 RX300 with 58K miles had check engine light and wouldn't go into overdrive, we changed the MAF sensor (tried to clean first) and it upshifted then check engine light came back on did a code read and it showed misfire in cyl 6, changed plugs, took 3 hours and this cleared up misfire, drove again and check engine light came on again, shop said KNOCK SENSOR code, this seems strange. Feeds to sensor has power, ck eng light comes on after a couple mile drive if it is reset. Anyone know howto fix this situation without paying $500. every time light comes back on?? Is one of the Knock Sensors bad? Many thanks, these check engine lights are a real problem with state inspections not passing now.
