Question 1

How to properly service and remove an oxygen sensor without causing damage on Volkswagen Jetta?

Accepted Answer

Since the oxygen sensor is fitted in the exhaust pipe, which is contracting when cold, it might be hard to loosen when the engine is cold. To prevent breaking an oxygen sensor or damaging its threads, ensure that you turn on and run the engine a minute or two then turn the engine off without burning yourself in the process. Particular care should be taken when servicing an oxygen sensor because they can never be taken apart by a permanent pigtail and have an electrical connector which cannot be removed; they would be permanently damaged. Also, do not allow grease, dirt and any other contaminants to touch the electrical connector and the louvered end of the sensor and never use any cleaning solvents on the connector. Oxygen sensors are very sensitive and therefore they should not be dropped or mishandled and the silicone boot should be fitted properly to avoid melting. Removing an upstream oxygen sensor: Find the oxygen sensor at the upper end of the catalytic converter or at the end of the exhaust manifold of 2.5L engines, and locate the wiring harness and strip the electrical connector of the sensor harness disengaging it. Unscrew sensor with an oxygen sensor socket to use on tight areas, and in case of re-insertion of the old sensor, apply anti-seize to the threads, which new sensors are already coated. In the case of downstream sensors, place the sensor in the centre and following the catalyst, disconnect the electrical connector, unscrew the sensor and place anti-seize compound in the case of replacing the old sensor. Installation is the opposite of removal and it is imperative to ensure that the oxygen sensor is firmly screwed to the required torque.

Question 2

What are the differences in oxygen sensor configurations, and how do they function in relation to the ECM and air/fuel ratio on Volkswagen Passat?

Accepted Answer

The four-cylinder models are fitted with two oxygen sensors, each pre-converter and post-converter, V6 models fitted with four each. The sensor elements interact with the oxygen in the exhaust to produce varying voltage output to a lean mixture of 0.1 volt to a rich mixture of 0.9 volt. The pre-converter sensor, which occurs in the front of the catalytic converter, provides feedback to the ECM about the oxygen concentration in the exhaust and thus it allows it to regulate the pulse width of the fuel injector and keep the air/fuel ratio at an optimal level at 14.7:1, resulting in optimal emissions, fuel economy and performance. The post-converter sensor, which follows the catalytic converter, has no effect on the air/fuel ratio, but assists the ECM in detecting efficiency of the catalytic converter by generating a slower changing voltage signal. The oxygen sensor does not produce a voltage until it reaches around 600-degrees F when the ECM will switch to an open-loop fuel control mode and depend upon other sensor inputs instead. The correct functioning of sensors needs proper electrical connections, free air circulation, right operating temperature, and usage of unleaded fuel. The ECM is able to detect different oxygen sensor faults and program diagnostic trouble codes and revert to open-loop control when defects arise. It is recommended to warm the engine a little to ease the removal of sensors and to take caution not to get burnt. In changing a sensor, the permanently attached pigtail and electrical connector are to be left in place and contaminants should be avoided in the connector and sensor end. The solvents are not to be cleaned and the sensor must be handled delicately. To replace the sensor which is of the pre-converter type, an opening is first achieved by removing the required parts, and to replace the sensor that is of the post-converting type, the vehicle should be placed safely on jackstands. Electrical connector is to be disconnected, and the sensor could be disassembled with the help of appropriate wrench or special socket. To ensure that the sensor threads could later be removed easily, one should apply an anti-seize compound to the thread, and then the sensor should be installed and firmly tightened after which the electrical connector has to be reconnected and the removal procedure should be followed in reverse.

Genuine Volkswagen Oxygen Sensor

92 Oxygen Sensors found

Volkswagen Rear Oxygen Sensor Part Number: 06K-906-262-EA

Volkswagen Oxygen Sensor Part Number: 06K-906-262-AP

Volkswagen Oxygen Sensor Part Number: 7B0-906-265

Volkswagen Oxygen Sensor Part Number: 03H-906-262-AP

Volkswagen Oxygen Sensor Part Number: 7B0-906-265-A

Volkswagen Oxygen Sensor Part Number: 06K-906-262-BF

Volkswagen Oxygen Sensor Part Number: 7B0-906-262-A

Volkswagen Oxygen Sensor Part Number: 7B0-906-262-B

Volkswagen Oxygen Sensor Part Number: 06E-906-262-K

Volkswagen Upper Oxygen Sensor Part Number: 06K-906-262-P

Volkswagen Oxygen Sensor Part Number: 06A-906-262-BG

Volkswagen Oxygen Sensor Part Number: 1K0-998-262-AE

Volkswagen Oxygen Sensor Part Number: 06K-906-262-CF

Volkswagen Oxygen Sensor Part Number: 021-906-265-AH

Volkswagen Oxygen Sensor Part Number: 021-906-265-AL

Volkswagen Oxygen Sensor Part Number: 06E-906-262-L

Volkswagen Oxygen Sensor Part Number: 051-906-265-E

Volkswagen Oxygen Sensor Part Number: 022-906-262-CC

Volkswagen Oxygen Sensor Part Number: 7B0-906-262

Volkswagen Oxygen Sensor Part Number: 078-906-265-F

Volkswagen Oxygen Sensor

Volkswagen Oxygen Sensor Parts and Q&A

Related Volkswagen Parts

Browse by Model