Engine light came on for maybe couple weeks. Took to a shop. They claim it was the sensor in the tank. I told him I wanted OEM part only. $2500 later I picked it up. No engine light on. Few miles down the road it came on. Went off yesterday when started the truck . This am no light on. Got in truck from an appt & it's back on. I've been
To O'Reillys b4 in the shop & after & reads the same code.. P203B. Shop is closed this week due to vacation.

Somewhat common problem, especially on the 11-16s. Check the wiring and/or fuse? Reset battery? If the part was just replaced it has to be upstream (you'd think).

retzy said:

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Engine light came on for maybe couple weeks. Took to a shop. They claim it was the sensor in the tank. I told him I wanted OEM part only. $2500 later I picked it up. No engine light on. Few miles down the road it came on. Went off yesterday when started the truck . This am no light on. Got in truck from an appt & it's back on. I've been
To O'Reillys b4 in the shop & after & reads the same code.. P203B. Shop is closed this week due to vacation.

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May sound weird but do you have fresh batteries? I've read on other forums that low or bad batteries can cause this to flare up.

Earlier today I reset both batteries (disconnecting ground) for 10 mins. One battery looked good . The other was corroded I had to use pliers to pull ground. Dealer replaced both batteries two years ago. I'm gna go & get load test@ no cost. If either one is bad they'll replace effected one(s). I have a year left on the warranty .