P1123 MERCURY Possible Causes
- Faulty throttle position sensor
- Throttle position sensor harness is open or shorted
- Poor electrical connection in the throttle position sensor circuit
- Faulty Powertrain Control Module (PCM)
How to Fix P1123 MERCURY Code?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Engine light on (or service engine soon warning light)
P1123 MERCURY Meaning
The Powertrain Control Module (PCM) monitors the throttle position sensor. The PCM sets this Diagnostic Trouble Code (DTC) when it detects that the throttle position sensor circuit has intermittent high voltage.