SOURCE: How do I remove the
Should only be 4 bolts & maybe a coolant hose
on some vehicles
Why are you removing it?
SOURCE: I have code 1151 on Mi 1999 ford expedition
P1151 Lack of HO2S21 Switches - Sensor Indicates Lean
Suspect that this is technical jargon for a faulty -O2 sensor ,Test them both with a multimulter for function .
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