Readers ask: Audi A6 Coolant Temperature Sensor?

How do I know if my coolant temperature sensor is bad?

What Signs May Signal Your Coolant Temperature Sensor May Be Failing?

  1. Poor Fuel Economy.
  2. Irregular Temperature Readings.
  3. Black Smoke from Your Exhaust.
  4. Your Engine is Overheating.
  5. Your Check Engine Light is On.

Can you drive without a coolant temperature sensor?

Unplugging the engine coolant sensor while the car is running will likely cause the engine to stumble and run rough. Unplugging the engine coolant temperature sensor before starting the engine may result in a no start, especially likely on a cold morning.

What does a coolant temperature sensor do?

A coolant temperature sensor (CTS) (also known as an ECT sensor or ECTS (engine coolant temperature sensor) is used to measure the temperature of the coolant/antifreeze mix in the cooling system, giving an indication of how much heat the engine is giving off.

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What happens if you unplug the coolant temp sensor?

If you unplug the coolant temperature sensor the PCM will see the lack of signal as a extremely low coolant temp. If you unplug the sensor when the engine is cold the engine may run smoothly at first but as the engine warms up the a/f mix will become too rich and the engine will start misfiring and possibly stall.

Will a bad coolant temperature sensor?

If the coolant temperature sensor goes bad it can send a false signal to the computer and throw off the fuel and timing calculations. It is not uncommon for the coolant temperature sensor to fail and send a permanently cold signal to the computer. This will reduce fuel economy, and may hinder engine performance.

How do you check a coolant temperature sensor?

  1. Step 1 – Locate Coolant Temperature Sensor. The coolant temperature sensor is located on the engine block under the hood.
  2. Step 2 – Connect Digital Volt-Ohm Meter.
  3. Step 3 – Check Readings.
  4. Step 4 – Check With Cold Sensor.
  5. Step 5 – Replace Defective Coolant Temperature Sensor.

How much does it cost to replace a coolant temperature sensor?

The average cost for engine coolant temperature sensor replacement is between $123 and $158. Labor costs are estimated between $82 and $104 while parts are priced between $41 and $54.

How long does a coolant temperature sensor last?

Often, the engine coolant temperature sensor must be replaced at about 100,000 miles. If you don’t properly maintain the engine cooling system, the sensor could fail much earlier.

Does the coolant temp sensor control the fan?

The sensor works by measuring the temperature that’s being given off by the thermostat and/or the coolant itself. The temperature is then sent to the on-board control system. As the control system receives the temperature from the CTS, it may trigger the cooling fan to either shut off or turn on.

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What is the difference between a coolant temperature sensor and sender?

A SENDER and a SENSOR can be the same. But a SENDER can be anything that sends a signal such as a telegraph sender. A SENSOR detects something such as temperature, pressure, light, etc. and generates a signal (which can be sent).

Do you need to drain coolant to change coolant temperature sensor?

Open the radiator valve and drain about two to three quarts of coolant. You only need to remove enough to drop the level below the sensor. Then close the drain valve. This will minimize coolant waste when you remove the sensor.

What problems can a bad ECT sensor cause?

So, a faulty (ECT) sensor that always reads cold may; cause the fuel control system to run rich pollute and waste fuel. Also, a (ECT) sensor that always reads hot may; cause cold driveability problems such as stalling, hesitation and rough idle.

Can a bad coolant temp sensor cause rough idle?

A faulty coolant sensor that always reads cold may cause the fuel control system to run rich, pollute and waste fuel. A coolant sensor that always reads hot may cause cold driveability problems such as stalling, hesitation and rough idle. This also affects engine performance and fuel economy.

Can a coolant temp sensor cause starting problems?

Bad coolant temperature sensor causes cold starting problems

But the owner had to pump the pedal to keep the engine running. Your symptoms are a dead ringer for a bad engine coolant temperature sensor (ECT). The computer is calculating an air/fuel mixture that is too lean.

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Can a bad coolant temp sensor cause hard start?

The sensor will not cause a no start. It could cause a hard start and a rich or lean condition only.

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