engine light on
2006 1500 4x4 w/4.7 says O2 sensor bad. I had a shop replace all 4 of the O2 sensors. The light is on and still says the #1 sensor on bank one. He says the computer has to be flashed?
Other issues can cause a O2 sensor warning such as a vacuum leak or the engine running too rich or lean.
Post the actual trouble codes if you have them.
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