2003 Ford F150 4.2L Code P1131

Question

2003 FORD F150 4.2L ENGINE
P1131 CODE

ALREADY REPLACED SPARK PLUGS ;O2 SENSOR; FUEL FILTER
WHERE SHOULD I CHECK NEXT?

Answer 1

P1131 Upstream 02 sensor not switching

Check the connection of the 02 sensor, a disconnection of the 02 sensor can set this code