Guide To P041B OBD Error Code Solutions

<<See All OBD Codes

An Exhaust Gas Recirculation (EGR) Temperature Sensor is an electrode that scans for EGR temperature and sends the signal to the engine control module. When the engine control module (PCM) identifies a false signal from the EGR Temperature Sensor, the PCM will set code P041B.

The purpose of the EGR temperature sensor is fundamental to giving a means for the ECM (Engine Control Module) to inspect the temperature of the EGR system and/or make small adjustments to the course by using a well-suited EGR valve. It easily accomplishes this by using a normal temperature sensitive resistor-type sensor. Your OBD (On-Board Diagnostic) scan tool might display P041B and related codes that are active when the ECM inspects a defect within the EGR temperature sensor or its circuits. As was described before, the system implies to the exhaust, which is heated, including when it deals with the vehicle’s hottest spots, so be wary of where your hands/fingers are going, even with the engine turned off for a short duration of time.

What causes this problem Exhaust Gas Recirculation Temperature Sensor "B" Circuit Range/Performance

• Faulted or corroded EGR (Exhaust Gas Recirculation) temperature sensor
• Leaking EGR temperature sensor gasket
• Split or drained Exhaust pipe as the sensor is being mounted
• Burned up Wiring harness and/or sensor
• Destroyed wire(s) (open, short to power, short to ground, etc.)
• Destroyed connector
• ECM (Engine Control Module) problem
• Bad connections

1. Exhaust Gas Recirculation - A vacuum leak, a clogged fuel injector, low fuel pressure, a leaking head gasket or other issues can result in boosting the effects of nitrogen oxides. Furthermore, a defective ignition, a vacuum leak or an ignition system issue can lead to a rough idle. Before spending money and replacing parts, solve the problems associated with the EGR valve and other system components in order to slim down the problem.
2. EGR Temperature Sensor - A crucial symptom that is frequent when dealing with a poor or failing EGR temperature sensor is engine ping or knock. If the EGR temperature sensor starts functioning badly, it results in problems identified with the EGR system channeling. This will lead to cylinder temperatures to hike up, creating engine ping or knock, which sound similar to rattling metal that is coming from the engine bay, and is the detection of a problem with the combustion operation. Any such issues result in engine ping or knock should be inspected as early as possible by a technician, otherwise the engine knock could cause critical engine damage if remaining unchecked.
3. Exhaust Pipe - An exhaust pipe that’s leaking can corrode plastic parts in the engine bay, and is risky to health, as the exhaust fumes are able access the car's cabin. If your exhaust manifold is cracked or leaking, the pressure of the backing inside of the exhaust system will be wrong, which can decline engine power, resulting in explosive sounds and other problems. It will mostly take 2 to 3 hours to repair the exhaust leak until complete, which depends on the complications of reaching to the exhaust manifold.
4. Powertrain Control Module - A deteriorating PCM could get unpredictable to an extent that your vehicle will have problems starting or even begin stalling while running. You will begin to notice that exhaust fumes have shorted when the car is running, emissions system control signals will begin failing, so with a PCM that’s not functioning correctly, you should have it replaced as early as possible.
5. Engine Control Module - Your vehicle might face difficulties starting, even after ensuring it’s vital the battery and starter are working correctly. If your vehicle’s problems face a potential failure in the engine control module, it should be replaced as soon as possible to prevent critical risks to your car in futures.

If you’re concerned with OBD error code P041B, there are considerate recurrent symptoms that you can easily feel or overlook. We are providing a list below to assist you with having a better understanding of this problem.

Common symptoms

• Defective smog or emissions state/provincial test
• Engine sounds (knocking, rattling, pinging, etc.)
• Noisier exhaust

The exhaust gas recirculation (EGR) system is constructed to reduce combustion temperatures and decrease oxides of nitrogen emissions (NOx). To succeed with this, exhaust gases are shown into the engine combustion chamber to cool off the combusting flare. Some vehicles use an EGR temperature sensor to give a search around during the EGR process. The powertrain control module (PCM) uses this data for to pursue the correct EGR control.

On most updated diesel engines, an EGR cooler is used to cool down the temperature of the exhaust gas before accessing the engine. The PCM depends on the EGR temperature sensors to check for the cooler’s responsibility. Basically, a single temperature sensor is placed on the exhaust manifold, and another is situated near the EGR valve.

The recurrent symptoms of a failed EGR temperature sensor also come in pinging, enhanced emissions and an illuminated Check Engine Light.

Locate the EGR temperature sensor

As a way to cautiously and impressively remove your EGR temperature sensor you need a few basic tools to make due:

• Free repair manuals (optional)
• Protective gloves
• Safety glasses

The EGR temperature sensor is normally mounted in the exhaust manifold or mounted near the EGR valve.

Remove the EGR temperature sensor

• Disconnect the bad battery cable and place it aside.
• Take off the electrical connector by pressing down on the tab and gliding it off.
• Loosen the sensor using a ratchet or wrench.
• Take off the sensor.

Install the new EGR temperature sensor

• Put in the new sensor. Mount the new sensor in its place.
• Screw in the new sensor by hand and then tighten it down using a ratchet or wrench.
• Reinstall the electrical connector. Connect the electrical connector by gliding it into place.
• Reconnect the bad battery cable and tighten it down.
• You have a newly installed EGR temperature sensor.

It is crucial to diagnose this code defect. A mechanic should follow these important steps for diagnosing the issue that pinpoints a P041B code to be stored:

Basic Step #1

First step to follow, it helps to survey anything that can be easily viewed by doing a visual monitoring of the sensor and surrounding EGR system, while searching for any particular exhaust leaks. Furthermore, survey for the sensor and its harness during of the systematic process. Take regards of what is explained about those high temperatures. They can cause serious damage on plastic and rubber coated wires, so examine them rigorously.

Basic Step #2

Many of the EGR problems overlooked in the past have occurred due to soot accumulating in the exhaust and in future were prompted by several other things, such as poor maintenance and low-quality fuel. In these matters, this is not an unusual case, so it’s beneficial to clean up your EGR system or the temperature sensor at the least. Be cautious that sensors mounted within the exhaust systems might appear to be snatched when attempting to loosen them up.

Just to remind you, these sensors are distinctly for considerable temperature changes, and even with the least amount of heat when using Oxyacetylene torch, except for the layman, might help loosen up the sensor. Once sensor is taken off, use the carburetor cleaner or similar product to thoroughly soak up the soot. Use a wire brush to loosen the soot in any excessively built up spots. In the process of reinstalling the cleaned sensor, make sure to to apply a sum of anti-seize to the threads to supportively keep them from looking snatched.

Basic Step #3

Confirm the solidity of the sensor by taking measure of the exact electrical values in comparison to particular requested values by the manufacturer. Attend to this by using your multimeter and follow the certain pinout test methods by the manufacturer.

Common mistakes when diagnosing the P041B code

• EGR temperature sensor Defect
• Powertrain Control Module (PCM) Defect
• Wiring Defect