How do you replace an exhaust gas temperature sensor?
If the exhaust gas temperature is not correct, it is time to replace it. Simply follow the best-practice advice.
- Find the sensor that is defective. The position of the sensors can vary depending on their function. They can be located either upstream or downstream of the turbocharger, catalytic converter, and DPF, as well as within the NOX reduction system.
- Next, disconnect the electrical connector. Finally, unscrew the sensor using a socket wrench. Be sure to not damage nearby components.
- Prepare the sensor. Apply anti-seize compound to the thread if necessary. To prevent damage to the component, handle carefully.
- Install the new exhaust gas temperature sensor, and tighten to the recommendations of the vehicle manufacturer.
- Then, repair the electrical connector. Next, the negative battery terminal.
- Now, connect the diagnostic tool to the computer and delete any related fault codes.
- Turn the ignition on and confirm that the check engine light has been turned off and that the exhaust system is functioning properly.
- Finally, do a road test.
What is the purpose of an exhaust gas temperature sensor?
The exhaust gas temperature sensor measures the temperature. This information is transmitted back to the ECU or engine control unit, where appropriate action can be taken. Its main function in petrol engines is to protect key components from higher temperatures than in smaller engines. If the sensor detects excessive temperatures, the ECU will reduce them by lowering boost pressure in the case of the turbocharger, or increasing the fuel injected into the catalytic convertor. To determine the right temperature for regeneration, the exhaust gases are also used in diesel engines. It is not uncommon to have three or more sensors in the exhaust. One is installed prior to the turbolcharger and one after the DPF. Source URL
What are the symptoms of a bad coolant temperature sensor?
A faulty exhaust gas temperature sensor can negatively affect the vehicle’s after-treatment system. This can lead to the following symptoms:
- Check engine light: If the ECU detects an issue with the sensor or signal, it will turn on the check engine light.
- Reduced fuel efficiency: If the sensor relays incorrect voltages, DPF regeneration can take longer and result in higher fuel consumption.
- Unnecessary DPF regeneration: Failing sensors can lead to unnecessary DPF regenerations, which can cause inconvenience to the vehicle owner.
- A false reading in emissions can cause the EGR system to malfunction and not trigger the check engine light. This can lead to an emissions test failure.
- PartComponent failure: Exhaust temperatures can also cause premature failure of other components of the engine.
Exposure to excessively high temperatures is a common cause of failure of exhaust gas temperature sensors. In some cases, it can cause them to fail. This is the very thing that they protect other components from. Like all wired sensors, severe vibration can loosen internal connections and any bends or twists can cause the wire to break. This can make them more vulnerable to damage when replacing other components in the exhaust system. These, along with contamination from other fluids such as antifreeze or oil, can cause sensor response characteristics to drift beyond tolerance and give inaccurate readings. Source URL
What are the common fault codes for exhaust gas temperature sensor?
Common fault codes include:
- P0544: Exhaust gas temperature sensor, bank 1, sensor 1 – circuit malfunction
- P0546: Exhaust gas temperature sensor bank 1, sensor 1 – High input
- P2033: Exhaust gas temperature bank 1, sensor 2 – circuit high
- P247A: Exhaust gas temperature sensor bank 1, sensor 3 – Out of range
- P0549: Exhaust gas temperature sensor, bank 2, sensor 1 – circuit high
- P2031: Exhaust gas temperature bank 1, sensor 2 – circuit malfunction
How do you program a tuner for a Ford F150 to measure exhaust gas temperature?
Additional Gauge Monitoring and Datalogging: F150 enthusiasts who are interested in data monitoring and logging can use F150 tuners to read from select sensors in real-time. Some of the larger tuners can be mounted on your dash and act as an addition gauge cluster. They monitor parameters such as air-to fuel ratio, exhaust gas temperature, boost pressure, and any sensor with a 0.1-5V source. Tuners can save this information to their computers and export it for later analysis. Source URL
How do I know if my exhaust gas pressure sensor is bad?
Consider these steps to diagnose an exhaust gas temperature sensor problem.
- An electronic test can be conducted and read fault codes using a diagnostic tool.
- Inspect the connectors for signs of corrosion or loose connections.
- Check for any damage or breaks to the wiring that could cause a short to the ground.
- Inspect the sensor for any contaminants and then clean it with a dry cloth if necessary.
- Use a separate IR measurement device to test the sensor. Compare the readings to live data obtained using a diagnostic tool. Compare them by turning the engine on so that the exhaust heats up.
- Turn the vehicle on and disconnect the plug from the EGT sensor. Measure the voltage at the connector of the sensor. It should be 5 volts. If you don’t, trace the wire back to the ECU and check supply there.
Where is the best place to put an exhaust temperature probe?
This question is more difficult to answer than you might think. There are two ways to measure exhaust gas temperatures for a diesel engine: before the turbo (turbine outlet temperature) or after the turbo. We recommend measuring the turbine inlet temperature when it is convenient. This is the most important temperature when evaluating engine performance. If there isn’t a convenient location for a probe to be placed in the exhaust side of the exhaust, you can mount the probe after it has reached the turbocharger. This will allow you to measure the turbine outlet temperature. This can also pose a problem. For example, the Duramax engine’s outlet for the turbo is not designed to accommodate the outlet. Source URL