93 Ranger 3.0 codes - Ranger-Forums - The Ultimate Ford Ranger Resource

2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 11-11-2015
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Join Date: Aug 2015
Location: Baldwinsville, Ny
Posts: 9
93 Ranger 3.0 codes

After putting the truck back together had issues with bubbles constantly flowing in the reservoir, I knew I had an issue with a head. So I had the heads redone and put everything back together for the 2nd time with better results. Everything seems to be fine with the temp and running. But after a second trial run after about 5 minutes of driving the check engine light came on. Went home and checked the codes. 543 and 172. Any ideas? I know what the code descriptions are, but anyone have an idea where to start?
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