Description: Fits 4Runner, Celica, MR2, TruckKnock Sensor - Repair or ReplaceA failed Knock Sensor will often have no noticeable symptoms beyond a check Engine light or Engine ping or knock, but it does cause your Toyota to operate inefficiently and produce higher emissions. Our technicians have Access to manufacturer-approved repair processes and Toyota genuine parts. MR2. Celica. With turbo. Pick-up. 6 cylinder. 4-runner. 6 cylinder.