Bmw e60 5-series 6-cylinder engine oxygen sensor replacement – pelican parts technical article e electricity bill payment


Oxygen sensors monitor the exhaust stream, comparing the oxygen content in it to the oxygen content of ambient air. When oxygen content is low, sensor voltage is high. When oxygen content is high, sensor voltage is low. The voltage created by the sensor is sent to the DME (engine control module) to help maintain a proper fuel mixture. The mixture preparation is used to keep the catalytic converters running at peak efficiency. The oxygen sensors used in E60 models covered in this article has four wires. Two of which are for oxygen sensor heating and two for the signal. The heater is used to get the sensor online faster. Previously, exhaust heat was used. One wire supplied a ground to the sensor for the signal, and the other was for the sensor signal.

Oxygen sensors should be replaced every 100,000 miles. In a perfect world that would be it. Wait until a specified mileage and replace the sensor. However, these sensors fail prematurely, set oxygen sensor fault codes and reduce fuel economy. In this article, I will show you how to identify the location of all four oxygen sensors and how to replace them. You will need an oxygen sensor socket to remove the sensors and remember to always work with a cool exhaust. Oxygen sensors are fragile. Do not drop, as damage may occur. Also, keep the sensor tip clean when reinstalling.

Oxygen sensors are laid out in banks, which refer to cylinders and in sensor numbers referring to before or after the catalytic converter. Bank1 or B1 refers to cylinders 1-3. Bank 2 or B2 refers to cylinders 4-6. Sensor 1 or S1 refers to the sensor before the catalytic converter. Sensor 2 or S2 refers to the sensor after the catalytic converter.

Remember that your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.


Followup from the Pelican Staff: You’ll need to see when fuel trim is off and which direction it is skewed. Here is a link with companion info for fuel trim and how to diagnose: – Nick at Pelican Parts

Comments: A couple of things were left out of this DIY. To get to these sensors, the strut brace on top and reinforcement plate below need to be removed. Each requires new bolts so be sure to have them on hand. Strut brace bolts #5171706381, reinforcement plate bolts #31106772199. ;

Comments: I recently replace both bank1 and bank2 sensors before cat and few days later, code comes up again with Engine check light which is p2298SAE CODE – 2C2E. what I can guess is O2 sensor itself wasn’t the problem. when I drive it, I can feel some kind of missfire but there isn’t code except p2298 O2 sensor out of range during deceleration, bank 2. what are the recommandation for this…

Comments: Quick ?, I forgot to mark the pre cat o2 sensors. I have a 2004 530i any help or tips on which connector goes to which? I do know grey goes to bank 2 and black goes to bank 1 but connecting them to the car both have the same with no markings. Thanks

I got an issued with my car especially when I replaced both the pre-cat oxygen sensor for bank 1 as well as Post-cat oxygen sensor for bank 1. A code is still recurring, namely, 23C1, a Bmw official code from the INPA. The code referring to Lambda probe in front of catalytic converter, trimming control. A more generic code detected this code, "P2096", this code referring to Post Catalyst Fuel Trim System Too Lean Bank 1. Seemingly, these codes are two different things unless they are the same things. The INPA made no mention of Post but Pre. But the Generie code detected as Post-cat is the issue. However, Upon on these codes, I have replaced both, ultimately.

Comments: I have the problem of rough idle and misfire on cylinder 3 during cold engine, I replaced spark plugs, coils and injectors but still the misfire was exist on cylinder 3, I checked o2 on bank 2 it was fixed on 1.195v I replaced the o2 but still the voltage of it is fixed on 1.1950v and the misfire is still exist on cylinder 3.

Comments: I have difficulty with the rear pre-cat sensor on a 2006 e60 n52. There is a metal frame, that the wiring harnesses sit on, and the opening of the frame is just big enough for the 02 sensor wire to come through. but I have no way to get an O2 socket into the space. I guess I could cut the old wire off, but I am not sure how I would be able to torque the new one in? Do I have to go under the car? Thanks

Comments: hi how are nick my question does the same procedure go for the bmw 550i n62 engine as well or u have a different location because i’m the code p2626 which says bank 1 sensor 1…but it was just change a few months ago so do u think the problem can be a faulty sensor or wrong sensor replaced……thank you very much