EGR Problem

EGR valve sticking open at idle is usually accompanied by a rough idle and/or stalling. Also check for shorted or leaking injector and fuel-contaminated oil. If Code 45 is intermittent, see INTERMITTENTS in appropriate TESTS W/O CODES article in the ENGINE PERFORMANCE.

Fig 1: Code 45 Schematic (4.0L) Bank 1 Oxygen Sensor Rich Exhaust

Fig 2: Code 45 Diagnostic Flow Chart (4.0L) Bank 1 Oxygen Sensor Rich Exhaust