My 99 frontier has been kicking out a code for the sensor since I inherited it 4 years ago. It's under the intake so alot of crap comes off to replace it.I now have coolant running down the pass. head. Guess it's time. I'm the type of person that when you dig deep into something,replace all that you can't get to once it's back together. Besides hitting the valve covers, heater hoses(I can see), spark plugs,I.A.C., Knock sensor, what else is under there to replace? I'm picking up the parts while a mechanic friend is doing the labor. I could do it but don't need my shop tied up for extended period since I'm wanting to hit Nellie Belle over the winter months plus body work on the 2fiddy. Love to have a list of replacement stuff so I can order the parts.