P0117 Mercury Code - Engine Coolant Temperature Sensor 1 Circuit Low
Quick Answer
The Engine Coolant Temperature (ECT) Sensor is a thermistor device in which resistance changes with temperature. Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) Sensor, Faulty engine coolant thermostat. 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
- P0117 Mercury indicates Engine Coolant Temperature Sensor 1 Circuit Low.
- Common causes
- Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) Sensor, Faulty engine coolant thermostat.
- 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 P0117 Mercury Description
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so varying the resistance of the passive sensor causes a variation in total current flow. The voltage that is dropped across a fixed resistor (pull-up resister) in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The ECT Sensor is located in an engine coolant passage and measures the engine coolant temperature. The PCM uses the engine coolant temperature input for fuel control and for cooling fan control. The ECT Sensor can be a threaded or twist lock type.
This Diagnostic Trouble Code (DTC) is set when the ECT Sensor signal is less than the self-test minimum. The ECT Sensor signal minimum is 121°C (250°F).
What are the Possible Causes of the DTC P0117 Mercury?
- Low engine coolant level
- Faulty Engine Coolant Temperature (ECT) Sensor
- Faulty engine coolant thermostat
- Engine Coolant Temperature Sensor harness is open or shorted
- Engine Coolant Temperature Sensor circuit poor electrical connection
How to Fix the DTC P0117 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0117 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 P0117 Mercury Code
1. What are the common symptoms of OBDII code P0117 in a Mercury vehicle?
- Common symptoms include poor fuel economy, engine overheating, rough idle, or even a stalling engine.
2. What are the potential causes of the P0117 code in a Mercury?
- The code is often triggered by a faulty engine coolant temperature sensor, a damaged sensor circuit, low coolant levels, or a malfunctioning thermostat.
3. How can I diagnose the issue causing the P0117 code in my Mercury?
- To diagnose the problem, you can use a multimeter to test the engine coolant temperature sensor's resistance, inspect the sensor's wiring for damage, check coolant levels, and verify proper thermostat operation.
4. What are some DIY repair tips for fixing the P0117 code in a Mercury?
- DIY repair tips include replacing the engine coolant temperature sensor, repairing or replacing damaged wiring, ensuring proper coolant levels, and testing and replacing the thermostat if necessary.
5. Can driving with the P0117 code present cause further damage to my Mercury vehicle?
- Driving with the P0117 code can potentially cause engine damage due to overheating or improper fuel mixture, so it's best to address the issue promptly.
6. How much does it typically cost to repair the P0117 code in a Mercury at a mechanic or dealership?
- Repair costs for the P0117 code can vary depending on the exact cause, but they generally range from $100 to $300 for parts and labor.
7. Is it safe to continue driving my Mercury with the P0117 code illuminated?
- It's not recommended to drive your Mercury with the P0117 code present, as it can lead to engine overheating and other potential issues that may cause further damage.
8. Can I reset the OBDII code P0117 in my Mercury without fixing the underlying issue?
- You can reset the code using an OBDII scanner, but the issue causing the code will likely persist and trigger the code again until properly addressed.
9. How long does it take to repair the P0117 code in a Mercury?
- The repair time for the P0117 code can vary based on the exact cause and the extent of the repair needed, but it typically takes 1-2 hours at a mechanic's shop.
10. Will fixing the P0117 code improve my Mercury's performance and fuel efficiency?
- Yes, addressing the P0117 code and ensuring the engine coolant temperature sensor is functioning properly can improve your Mercury's performance and fuel efficiency.
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