I changed mine. I was losing coolant and oil and there were signs of antifreeze in the oil (analysis). My truck was on 45,000 miles so pretty certain they were the originals. They were and needed changing.
If you (or anyone else) decides to do this job and doesn't have a scan tool - this worked for me.
If you (or anyone else) decides to do this job and doesn't have a scan tool - this worked for me.
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