P1132 Ford - 2002 4.6L expedition

Question

rough idle, hesitation, engine stumbles and stalls out at low rpm's

Answer 1

P1132 Upstream 02 sensor not switching

Vacuum leak is the cause for this code condition,especially when it causes the rough idle and engine stumble,

This connector here is from a Ford 4.6 where it caused rough idle and a lean code condition with a 02 sensor code not switching, , this connection went to the throttle body,Replacing this connection solve the issue.What you need to look for are vacuum leak, and this includes the brake booster vacuum hose.