So I have my 5.3l 04 trailblazer throwing codes for the tps and knock sensor. Codes p0120 p0220 and p0332. First 2 are tps sensors a and b. Last code is knock sensor bank 2. Any suggestions before I tear both off and replace them. If not any tips on replacing them??

Vehicle: 2003 Envoy XL SLE 4.2L I-6 Mileage: 92,000 Hi everyone - I am desperately looking for help on the rather serious REP issue. Yesterday, for example, REP manifested itself no fewer than 45 times while my girlfriend was driving it. Today, I took the vehicle for my usual 34 mile commute...

I have a 2006 Trailblazer LS 6 Cylinder. I am getting a P1516 code after replacing the ignition switch. Many variables with this code. Try and clean throttle body? Battery might be a bit low but starts fine. Slightly rough idle. Checked all connections and nothing loose or obvious. Any ideas?