Codes P0300 and P050B?

Tiny
LPL
  • MEMBER
  • 2011 MERCEDES BENZ GL450
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 113,000 MILES
I changed the spot pleasant coils a few months ago. However, last week when I went to start the car and misfired. When I plugged in the OBD reader, it gave me a code of P0300 cylinder 6 misfire. So, I went and bought more expensive spark plugs thinking this might have been the issue with a faulty spark plug. I've got to replace it with the new spark plugs again. This time the car crank, just a little Dennis thought I'm making a weird like whining noise. I would like to start over timing, turning applaud the OBD reader again this time it gave me codes of all cylinder misfiring, and P050B coast start timing. What could have caused the maintenance? Always up to date, never had any issues. Not even any warnings before this happened.
Friday, December 29th, 2023 AT 9:55 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 49,963 POSTS
"Spot pleasant" that's a good one. Yep, these cars are difficult to change the spark plugs in and cracking the spark plugs occurs often. Did you use a spark plug socket with internal padding? If not, this can be the problem, also I would only use OEM coils on this car. I would get a new MAF sensor if you have already. This sensor is a normal service item over 100,000 miles.

Here is a video that can show you how with instructions for your car below:

https://youtu.be/QOMiXhx2hbI?si=adPCQa-vv50u5LzN

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Friday, December 29th, 2023 AT 12:32 PM

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