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39 Posts
Discussion Starter · #1 ·
Hello, my 2006 RR 4.2 Supercharged is throwing this code. I've read the other threads on this forum but I'm not sure if I should replace the temp sensor or start with the thermostat. It seems for some people it was a thermostat issue and for some the top sensor and others the bottom sensor.

I'm also throwing a P2099 code and have changed out the front 2 oxygen sensors and two cats (was throwing the cat codes P0430, P0420) but those codes are now gone. Still getting the P2099 though and wondering if maybe the back Oxygen sensors need to be changed too.

Any thoughts/help is much appreciated.


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