There is only one bank of sensors on the four cylinder vehicle. The first sensor is the upstream one, or the one in front of the catalytic converter. I had to replace the downstream one.
The first step was locating the sensors. Opening the hood, you can see both sensors to the left of the engine. [Here, it's just to the right of the red-box-looking area.]
And zooming in...
Mercedes provides a special tool for removing the sensor - it's something like a crow's foot, offset, open socket. For this repair an adjustable crescent wrench was used, though it was difficult to apply enough torque in the limited space.
To access the wiring harness, the vehicle had to be raised. The plastic undercarriage panel below the sensor was removed. The sensor wires were removed from the retaining clips. The wiring harness was located on the opposite side of the engine.
An awl was used to depress the nubs on the wiring harness in order to separate it. Here, an arrow points to a triangular indentation that is not visible from this perspective.
The wiring harness connector was attached to the replacement sensor using the supplied kit. Bosch recommends not soldering on a new connector - likely because of the heat involved. Installation was straightforward.
Here, the new and old sensors are compared:
You completely match our expectation and the variety of our information. Oxygen sensors
ReplyDelete