P1117 MERCURY – Intermittent Engine Coolant Temperature Sensor

P1117 MERCURY Possible Causes

  • Low engine coolant level
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Poor electrical connection in the Engine Coolant Temperature (ECT) sensor circuit
  • Faulty engine coolant thermostat
  • Damaged Powertrain Control Module (PCM)

How to Fix P1117 MERCURY Code?

Start by checking the “Possible Causes” listed above. Visually inspect the related 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)
Engine Overheating

P1117 MERCURY Meaning

The Engine Coolant Temperature (ECT) sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and resistance increases as the temperature decreases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical signals to the Powertrain Control Module (PCM) corresponding to the temperature.

Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network, so the change in the passive sensor’s resistance causes a change in the total current flow. The voltage that drops across a fixed resistor (pull-up resistor) in series with the sensor resistance determines the voltage signal to the PCM. This voltage signal equals the reference voltage minus the voltage drop across the fixed resistor.

The ECT measures the engine coolant temperature. The PCM uses the ECT input for fuel control and for cooling fan control. There are 3 types of ECT sensors: threaded, push-in, and twist-lock. The ECT sensor is located in an engine coolant passage.

P1117 MINI – Low input of mass or volumetric air flow circuit, row 2

P1117 MINI Possible Causes

  • Faulty mass air flow sensor
  • Mass air flow sensor harness is open or shorted
  • Poor electrical connection in mass air flow sensor circuit

How to Fix P1117 MINI 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

Check engine light on (or service engine soon warning light)

P1117 MINI Meaning

Input Bank 2 is the generic description for P1117 Mini code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the P1117 Mini OBDII code.

P1117 SCION – Coolant Temperature Sensor Circuit for Coolant Heat Storage System

P1117 SCION Possible Causes

  • Low engine coolant level
  • Faulty Engine Coolant Temperature (ECT) sensor for HST
  • Engine Coolant Temperature (ECT) sensor for HST harness is open or shorted
  • Engine Coolant Temperature (ECT) sensor for HST electrical circuit poor connection
  • Faulty engine coolant thermostat

How to Fix P1117 SCION Code?

Begin by checking the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check Engine Light On (or Service Engine Soon Warning Light)

P1117 SCION Meaning

The Coolant Temperature Sensor Circuit Stack for Coolant Heat Storage System is the generic description for P1117 Scion code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the OBDII P1117 Scion code.

P1117 TOYOTA – Coolant Temperature Sensor Circuit Bank for Coolant Heat Storage System

P1117 TOYOTA Possible Causes

  • Low engine coolant level
  • Faulty Engine Coolant Temperature (ECT) sensor for HST
  • Engine Coolant Temperature (ECT) sensor for HST circuit open or shorted
  • Engine Coolant Temperature (ECT) sensor for HST electrical circuit poor connection
  • Faulty engine coolant thermostat

How to Fix P1117 TOYOTA 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 engine service warning light soon)

P1117 TOYOTA Meaning

The coolant temperature sensor circuit bank for coolant heat storage system is the generic description for Toyota P1117 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about Toyota P1117 OBDII code.

P1117 VOLKSWAGEN – Heated Oxygen Sensor Heater Short to Ground, Bank 1 Sensor 2

P1117 VOLKSWAGEN Possible Causes

  • Faulty HO2 Sensor, Bank 1 Sensor 2
  • HO2 Sensor Bank 1 Sensor 2 harness is open or shorted
  • HO2 Sensor, Bank 1, Sensor 2 circuit, poor electrical connection

How to Fix P1117 VOLKSWAGEN 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

Check Engine Light on (or Service Engine Soon Warning Light)

P1117 VOLKSWAGEN Meaning

HO2S Heater Circuit Short to Ground, Bank 1 Sensor 2 is the generic description for Volkswagen P1117 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we do not have further information about the Volkswagen P1117 OBDII code.

P1118 – Engine Coolant Temperature Signal Out of Range High

P1118 Possible Causes

  • Faulty Engine Coolant Temperature (ECT) sensor
  • Low engine coolant level
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Poor electrical connection in Engine Coolant Temperature (ECT) sensor circuit
  • Faulty engine coolant thermostat

How is P1118 Code Repaired?

Begin by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check Engine Light on (or service engine soon warning light)

P1118 Meaning

The Engine Coolant Temperature (ECT) sensor contains a semiconductor device that changes resistance based on temperature (a thermistor). The ECT sensor is mounted in the left bank cylinder head near the front of the engine. The ECT sensor has a signal circuit and a ground circuit. The PCM applies a voltage (approximately 5.0 volts) to the sensor signal circuit. The PCM monitors changes in this voltage caused by changes in the sensor’s resistance to determine the engine coolant temperature.
When the engine coolant is cold, the sensor’s (thermistor) resistance is high and the PCM signal voltage is only slightly lowered across the sensor to ground. The PCM detects a high signal voltage (low temperature). When the engine coolant is hot, the sensor resistance is low and the signal voltage is lowered further. This causes the PCM to detect a low signal voltage (high temperature).

P1118 TOYOTA PRIUS – High Value of Coolant Temperature Sensor Circuit for Coolant Heat Storage System

P1118 TOYOTA PRIUS Possible Causes

  • Coolant heat storage tank
  • Faulty engine coolant temperature (ECT) sensor for CHS (coolant heat storage)
  • Low engine coolant level
  • Engine coolant temperature (ECT) sensor for HST circuit open or shorted
  • Engine coolant temperature (ECT) sensor for HST circuit poor electrical connection
  • Faulty engine coolant thermostat

How to Fix P1118 TOYOTA PRIUS Code?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Check engine light on (or service engine soon warning light)

P1118 TOYOTA PRIUS Meaning

This system uses an electric pump to supply hot coolant stored in the coolant heat storage tank to the engine cylinder head, to optimize engine start-up combustion and reduce the amount of unburned gas discharged during engine starting. Before engine starting, the ECM operates the electric water pump to direct hot coolant from the heat storage tank into the engine, to heat the cylinder head (this process is called “preheat mode”). The electric water pump operation time varies depending on the cylinder head temperature. During normal engine operation, the water valve opens the passage between the cylinder head and the heater and closes the passage between the cylinder head and the tank.
During preheat mode when the cylinder head is being heated, the water valve opens the passage between the tank and the cylinder head, to allow coolant to flow from the tank to the cylinder head. At this point, to quickly warm the intake port before engine starting, the coolant flows in the reverse direction

P1118 AUDI – Open HO2S Heater Circuit, Bank 1 Sensor 2

P1118 AUDI Possible Causes

  • Faulty HO2 sensor, bank 1 sensor 2
  • HO2 Sensor Bank 1 Sensor 2 harness is open or short-circuited
  • HO2 sensor, bank 1, sensor 2 circuit, poor electrical connection

How to Fix P1118 AUDI Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Engine light on (or engine service warning light soon)

P1118 AUDI Meaning

HO2S Heater Circuit Open, Bank 1 Sensor 2 is the generic description for Audi P1118 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about the Audi P1118 OBDII code.

P1118 BMW – High Input of Mass or Volumetric Air Flow Circuit, Row 2

P1118 BMW Possible Causes

  • Faulty mass air flow sensor
  • Mass air flow sensor harness is open or shorted
  • Poor electrical connection in mass air flow sensor circuit

How to Fix BMW P1118 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

Check engine light on (or service engine soon warning light)

P1118 BMW Meaning

The mass air flow or volume air flow circuit bank 2 input is the generic description for BMW P1118 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the P1118 BMW OBDII code.

P1118 BUICK – Engine Coolant Temperature Signal Out of Range High

P1118 BUICK Possible Causes

  • Faulty Engine Coolant Temperature (ECT) sensor
  • Low engine coolant level
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Poor electrical connection in the Engine Coolant Temperature (ECT) sensor circuit
  • Faulty engine coolant thermostat

How to Fix P1118 BUICK Code?

Start by checking the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

Illuminated engine light (or engine service warning light soon)

P1118 BUICK Meaning

The Engine Coolant Temperature (ECT) sensor contains a semiconductor device that changes resistance based on temperature (a thermistor). The ECT sensor is mounted in the left bank cylinder head near the front of the engine. The ECT sensor has a signal circuit and a ground circuit. The PCM applies a voltage (approximately 5.0 volts) to the sensor’s signal circuit. The PCM monitors changes in this voltage caused by changes in the sensor’s resistance to determine the engine coolant temperature.
When the engine coolant is cold, the sensor’s resistance (thermistor) is high and the PCM signal voltage is only slightly lowered across the sensor to ground. The PCM detects a high signal voltage (low temperature). When the engine coolant is hot, the sensor’s resistance is low and the signal voltage is lowered further. This causes the PCM to detect a low signal voltage (high temperature).