P0486 OBD Error Code: Problem & Solutions

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OBD II Code P0486 refers to exhaust gas recirculation (EGR) valve position sensor B -circuit malfunction. Trouble code P0486 is a generic trouble code relating to a problem incurred in the "B" electrical circuit to the exhaust gas recirculation (EGR) valve. It indicates that PCM has detected a problem with the rate of flow of the exhaust gas recirculation (EGR) system. If the PCM does not detect the desired degree of change in manifold air pressure, when the EGR valve is activated, a code will be stored.

OBD-II Code P0486 is defined as an Exhaust Gas Recirculation Sensor "B" Circuit. This is a generic powertrain diagnostic trouble code (DTC), which means it covers all makes/models. Some vehicles have an EGR position sensor to monitor the EGR valve itself and the purpose of the EGR valve is to introduce a regulated amount of exhaust gas into the intake manifold. If the manifold air pressure fails to coincide with the PCM calculations, a code will be stored and a service engine lamp illuminated. Some vehicle models require multiple drive cycles for a malfunction indicator lamp to be illuminated.

What causes this problem with the Exhaust Gas Recirculation Sensor "B" Circuit?

• Blocked EGR passages and DPFE sensor passages
• Faulty EGR Sensor
• Defective MAP Sensor
• Poor electrical wiring and connectors
• Defective EGR control solenoid
• Damaged vacuum line

1. EGR Sensor - EGR sensor is a sensor that detects the pressure changes in the EGR system. If it is malfunctioned, should be replaced immediately to avoid furthermore problems.
2. EGR Solenoid - When the EGR control solenoid is activated, a passage is opened up that allows exhaust gases into the intake manifold. The EGR solenoid is controlled by the engine computer, and activated at very specific times in order to achieve the best performance, efficiency, and emissions from the engine. So, make sure it should work efficiently.
3. Wiring Harness - A cable harness, also known as a wire harness, cable assembly, wiring assembly or wiring loom, is an assembly of electrical cables or wires which transmit signals or electrical power. Damaged or corroded wiring harness always creates problems.
4. Powertrain Control Module - Powertrain Control Module (PCM),is the brains of the engine control system, so when the brain is not functioning correctly neither is the engine or anything else that the microprocessor controls - which may include the charging system, transmission, various emission controls and communications.

Some common symptoms of the error code P0486 are below mentioned. Once you discover any of these issues, get your vehicle diagnosed and address that problem immediately to avoid major problems and expensive repairs.

• Stuck or partly open EGR pintle
• Pinging sound can be heard while high rpm
• Reduced engine performance
• Increased level of fuel consumption
• Illuminated check engine light

Sometimes you might not notice any symptom for this error code P0486, but if you notice any of the above-mentioned symptoms, try to resolve the issue as soon as possible to avoid huge expenses in near future. Some common repairs and replacements to fix this code are as follows:

• Replace the faulty EGR sensor “B”.
• Inspect the wiring harness carefully if damaged then repair or replace it as required.
• Check the level of a Vacuum to the EGR solenoid, if discover any fault, repair or replace it as required.
• If in case you find EGR position sensor is defective, replace that as well.
• Inspect the differential pressure feedback EGR sensor; if it is malfunctioned replace it immediately.

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For diagnostic procedures and to determine the proper wire identification, one should require a service manual. Below mentioned steps will help you to diagnose this code easily:

• Begin with the visual inspection of EGR sensor connector. Check if it has corrosion, bent or pushed out terminals. Clean off any corrosion and reseat the connector.
• Check for choking in the EGRs intake and exhaust.
• Clean out if there is any choking so that the pintle moves smoothly.
• Inspect the vacuum line from the EGR to the solenoid and do the necessary repairs and replacements if any defects are found.
• Check out carefully if solenoid electrical connectors have any corrosion or defects.
• Examine the two pressure hoses and use a service manual if required to continue to test the wiring circuits. Clean the corroded hoses and the sensor will start to operate again.

Note: It is always recommended to take your vehicle to a reputed service facility for the proper diagnosis by an experienced diagnostician as it may require the diagnostic equipment’s as well.

Common Mistakes When Diagnosing the P0486 Code

The most common mistake which usually happen while diagnosing the code P0486 is the replacement of expensive “EGR valve”, without even diagnosing it carefully. Usually the other components and circuitry are the main cause responsible for storing this code and EGR valve has nothing to do with it.