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1992 300CE
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46 Posts
Discussion Starter · #1 ·
I just purchased a 97 E320 with 60,000 miles. The check engine light came on and the computer says it's the rear O2 sensor.

I haven't had time to purchase a manual for this car yet, or put it up on jacks to look... anyone know how difficult it is to replace this sensor?

Also, are the Bosch sensors good?
 

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2003 E500 Tectite Grey Metallic
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52 Posts
Not that difficult at all. I ended up replacing all of the O2 sensors on my 1998 E320. I figured what the heck - do em all and never have to worry again. Anyway, you need to purchase an oxygen sensor socket tool at your local auto parts store. It's got a groove on the side for the sensor wire to fit in so it doesn't get twisted or broken. I sprayed some liquid wrench on the old sensors and let them sit for about half an hour to loosen up. Out with the old and in with the new. The hardest one to replace was the front one on the drivers side. Difficult to access but I finally got it from the top with a long extension. Oh yeah, the Bosch sensors are fine. Hope you solve your problem.
 

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2003 E500 Tectite Grey Metallic
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52 Posts
Check out Autohaus Arizona for a great price on the O2 sensors. I saved a bundle by not paying dealer cost.
 

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E-Class, SLK
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412 Posts
Don’t know what your fault code number is but code P0150 is related to Oxygen Sensor 1 form Bank 2. I replaced mine last December. It took me 15 minutes to replace both sensors (front right and left). You must have the right tools to do the job and they are relative inexpensive and you can get them from any auto parts store (AutoZone, Advance Auto Parts, PepBoys, etc). Tools you need are: (1) Oxygen Sensor or Vacuum Socket (around $10) and (2) At least a 15-in extension bar for a 3/8-in drive. You may put several extension bars to meet that length (I bought my 10â€? extension at a Big!Lots store for $2.49). If you are not as familiar with the W210 engine as me, locating the right O2 sensor is a challenge. No sweat, under the hood and on the driver side, locate the black cap for the brake fluid reservoir and a letter Z of the Benz on the engine’s cosmetics cover. Draw a straight imaginary line between the black cap and letter Z, you will see a narrow cavity between the engine block and insulated firewall. Identify the round-blue wire (don’t know if it comes with a different color but mine was blue) for the sensor. Unplug the connector (using a small flat screwdriver tip to lift its notch and pull it out); trace the wire to the other end to locate the sensor at the bottom-left of the engine (this is why you need an extension bar to take the sensor off). My trick to install the sensor is holding the tip of the O2 wire (without O2 socket) and drop the sensor into the screw hole then slowly twist the wire clockwise a few turns to make sure the sensor is screwed on correctly. Pay attention when using the O2 socket so it won’t strip and cut the wire.

I searched the internet and found that Autohuasaz.com offers the best price for O2 ($73.07). Part for Oxygen 1 (left side) is 0258003642009. I also replaced the sensor from the right (part # 0258003798009) and of course they are from Bosch.
 
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