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P2085 Mercury Code - Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 2

Quick Answer

The P2085 code for a Mercury vehicle indicates a problem with the exhaust gas temperature sensor circuit for Bank 1 Sensor 2. Common causes include Faulty Sensor: The exhaust gas temperature sensor itself may be faulty and need to be replaced, Damaged Wiring: Wiring or connectors in the sensor circuit may be damaged or corroded, leading to intermittent connections, ECM Malfunction: Problems with the engine control module (ECM) can also trigger the P2085 code. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P2085 Mercury indicates Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 2.
Common causes
Common causes include Faulty Sensor: The exhaust gas temperature sensor itself may be faulty and need to be replaced, Damaged Wiring: Wiring or connectors in the sensor circuit may be damaged or corroded, leading to intermittent connections, ECM Malfunction: Problems with the engine control module (ECM) can also trigger the P2085 code.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P2085 Mercury Description

The P2085 code for a Mercury vehicle indicates a problem with the exhaust gas temperature sensor circuit for Bank 1 Sensor 2. This sensor is responsible for monitoring the temperature of the exhaust gases leaving the engine. The signal from this sensor is used by the engine control module (ECM) to adjust fuel injection timing and optimize engine performance.

OBDII Code P2085 Mercury - Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 2
P2085 Mercury Code - Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 2

Common Causes of P2085 Mercury

  1. Faulty Sensor: The exhaust gas temperature sensor itself may be faulty and need to be replaced.
  2. Damaged Wiring: Wiring or connectors in the sensor circuit may be damaged or corroded, leading to intermittent connections.
  3. ECM Malfunction: Problems with the engine control module (ECM) can also trigger the P2085 code.
  4. Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings and trigger the code.
  5. Poor Quality Fuel: Low-quality fuel can sometimes cause issues with the exhaust gas temperature sensor.

Symptoms of P2085 Mercury

  1. Check Engine Light: The most obvious symptom of the P2085 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A faulty exhaust gas temperature sensor can lead to poor fuel efficiency as the ECM may not be able to adjust fuel injection timing correctly.
  3. Rough Idle: The vehicle may experience rough idling or stalling when the sensor circuit is intermittent.
  4. Reduced Engine Performance: Drivers may notice a decrease in engine performance, such as slower acceleration or a lack of power.
  5. Increased Emissions: A malfunctioning exhaust gas temperature sensor can lead to increased emissions from the vehicle.

How to Fix P2085 Mercury

  1. Diagnose the Issue: Use a scan tool to read the code and conduct a thorough inspection of the exhaust gas temperature sensor circuit to identify the root cause of the problem.
  2. Replace the Sensor: If the sensor is found to be faulty, replace it with a new, OEM sensor.
  3. Repair Wiring: If wiring or connectors are damaged, repair or replace them as needed to ensure a secure connection.
  4. Check ECM: Inspect the engine control module for any signs of damage or malfunction and address any issues found.
  5. Clear Codes: After the repairs have been made, clear the diagnostic trouble codes (DTCs) and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P2085 Mercury

The cost of repairing a P2085 code on a Mercury vehicle can vary depending on the specific cause of the issue and the labor rates in your area. Generally, the price of a new exhaust gas temperature sensor can range from $50 to $200, depending on the make and model of your vehicle. Labor costs can also vary, with rates typically ranging from $80 to $150 per hour at most auto repair shops.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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