Codes p0140 and p2237, Oxygen Sensor

2007 MERCEDES BENZ E500
140,000 MILES • V8 • 4WD • AUTOMATIC
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BHAMDOC1
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  • 280 POSTS
Which one of the oxygen sensors should I look at? I need to check the harness connector and maybe replace the sensor, so location would be appreciated. This is for the 2007 e550 not e500.
Mar 8, 2022 at 8:28 AM
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SQM
  • ✓ASE Certified Mechanic
  • 6,383 POSTS
  • ASE Certified Mechanic
Hello,

These codes are for the right-side oxygen sensor after the converter.

This code is typically generated due to wiring issues.
I have attached the diagnostics steps for code P0140 below. It shows the exact steps you will need to take to find the issue.

Please let me know if you have any questions.
Thank you.
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Mar 8, 2022 at 2:42 PM
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