P1120 Mercury Code - Throttle Position Sensor Out of Range
Quick Answer
The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1120 Mercury indicates Throttle Position Sensor Out of Range.
- Common causes
- Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1120 Mercury Description
• Closed throttle (includes idle or deceleration)
• Part throttle (includes cruise or moderate acceleration)
• Wide open throttle (includes maximum acceleration or de-choke on crank)
• Throttle angle rate
What are the Possible Causes of the DTC P1120 Mercury?
- Faulty throttle position sensor
- Throttle position sensor harness is open or shorted
- Throttle position sensor circuit poor electrical connection
- Throttle position sensor not properly adjusted
How to Fix the DTC P1120 Mercury?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1120 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1120 Mercury Code
1. What does the OBDII code P1120 mean for a Mercury vehicle?
P1120 indicates that the throttle position sensor (TPS) is reading values outside the expected range, signaling a potential issue with the sensor or its circuit.
2. What are the common symptoms of P1120 in a Mercury vehicle?
Symptoms may include poor acceleration, rough idling, hesitation during acceleration, reduced fuel efficiency, and the check engine light turning on.
3. What causes the P1120 code to appear?
Common causes include a faulty throttle position sensor, damaged wiring or connectors in the TPS circuit, or a malfunctioning PCM (powertrain control module).
4. How can I diagnose the P1120 code?
Start by checking the TPS and its wiring for physical damage or loose connections. Use a multimeter to measure voltage and continuity in the TPS circuit.
5. Can a dirty throttle body cause the P1120 code?
A dirty throttle body is unlikely to trigger P1120 directly, but it can cause related issues that affect throttle performance. Cleaning the throttle body might help eliminate other potential problems.
6. How do I fix the P1120 code on my Mercury vehicle?
Repairs may involve replacing the throttle position sensor, repairing damaged wiring or connectors, or updating/replacing the PCM if it’s faulty.
7. Can I still drive my Mercury with the P1120 code?
Driving may be possible, but it’s not recommended as the vehicle may experience reduced performance or unsafe driving conditions like sudden acceleration or stalling.
8. How much does it cost to fix the P1120 code?
Repair costs can vary, but replacing a TPS typically costs $100-$300, including parts and labor. Wiring or PCM repairs may cost more depending on the extent of the damage.
9. Does the P1120 code always mean the TPS is bad?
Not necessarily. The issue could be related to wiring, connectors, or the PCM, so proper diagnosis is essential.
10. Will resetting the check engine light clear the P1120 code permanently?
Resetting the light may clear the code temporarily, but the issue will persist if the underlying problem isn’t fixed, causing the code to return.
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