2009 W221 S550 acting very weird
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Newbie
Joined: May 2022
Posts: 5
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W221 2009 S550
2009 W221 S550 acting very weird
Hi all,
First of all, I want to thank you in advance for your help with this matter. I have recently purchased a 2009 S550 from an older gentleman with 82k miles on it. The car had only 1 pervious owner and has an excellent maintenance record.
The problem I am having is that the car started the run erratically all of a sudden. I was driving yesterday and suddenly the car started to misfire and slightly accelerate on its own, then the CEL came on. So I pulled over and noticed that the car revs un-commanded to around 2000 rpms. However, it shifts fine through the gears and responds normally to the brakes. I managed to drive the car home and ran a quick diagnostic and found 5 codes related to the CEL, which two of them indicated O2 sensor Bank 1 and Bank 2 Sensor 1. The icarsoft OBD2 I have was not able to read the other 3 codes. I also ran a manual diagnostic and found a series of current codes including the followings:
-1337
-0217
-1061
-0600
-2313
-6264
-2A23
-9005
-9001
I have cleared the CEL codes and reset the ECU and the car is now running just fine. I wanted to check with you and see if anyone has encountered this in the past or has any idea what this might be. Maybe it is a control unit issue? I have have had a 'Control Unit Performance' CEL light come up in the past along with I believe a 'Control Unit Low voltage' message (I cannot recall the exact message but it was voltage related). Could this be a bad battery? The battery was last replaced in December 2020 at a Mercedes dealership and the brand is DieHard.
Any help with this will be greatly appreciated.
First of all, I want to thank you in advance for your help with this matter. I have recently purchased a 2009 S550 from an older gentleman with 82k miles on it. The car had only 1 pervious owner and has an excellent maintenance record.
The problem I am having is that the car started the run erratically all of a sudden. I was driving yesterday and suddenly the car started to misfire and slightly accelerate on its own, then the CEL came on. So I pulled over and noticed that the car revs un-commanded to around 2000 rpms. However, it shifts fine through the gears and responds normally to the brakes. I managed to drive the car home and ran a quick diagnostic and found 5 codes related to the CEL, which two of them indicated O2 sensor Bank 1 and Bank 2 Sensor 1. The icarsoft OBD2 I have was not able to read the other 3 codes. I also ran a manual diagnostic and found a series of current codes including the followings:
-1337
-0217
-1061
-0600
-2313
-6264
-2A23
-9005
-9001
I have cleared the CEL codes and reset the ECU and the car is now running just fine. I wanted to check with you and see if anyone has encountered this in the past or has any idea what this might be. Maybe it is a control unit issue? I have have had a 'Control Unit Performance' CEL light come up in the past along with I believe a 'Control Unit Low voltage' message (I cannot recall the exact message but it was voltage related). Could this be a bad battery? The battery was last replaced in December 2020 at a Mercedes dealership and the brand is DieHard.
Any help with this will be greatly appreciated.
Thread Starter
Newbie
Joined: May 2022
Posts: 5
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W221 2009 S550
Thanks for the reply! If it was due to bad gas, I am assuming the issue will come back but I have driven the car today without issues. I use 93 octane from the same gas station for years and never had a bad gas issue. I am thinking this is related to electronics as the car started acting normal immediately after resetting the ECU reset.
Super Member
Joined: Dec 2018
Posts: 857
Likes: 501
From: Washington, DC
2007 S600, 2007 Chrysler 300 SRT8, 2000 C5 Corvette, 2017 Mustang GT, 2023 300C, and a 2019 Lincoln
It does sound like bad gas or maybe a dirty fuel filter. I would also run a can of fuel cleaner through it. If any of the codes return, keep us posted. With all of those strange codes you listed; it is very hard to pinpoint the problem.
Thread Starter
Newbie
Joined: May 2022
Posts: 5
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W221 2009 S550
Super Member
Joined: Dec 2018
Posts: 857
Likes: 501
From: Washington, DC
2007 S600, 2007 Chrysler 300 SRT8, 2000 C5 Corvette, 2017 Mustang GT, 2023 300C, and a 2019 Lincoln
I use a 20 oz plastic bottle of Techron every other month on the first of the month. To get the best effects, I wait until the fuel tank is less than 1/4, add the Techron, drive it to the gas station (about 5 miles) and fill it up with 93 octane. Everyone always tells me additives are B.S., but a number of us have had really good results. I buy Techron by the case of six on Amazon.
Keep us posted on the news.
Keep us posted on the news.
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Out Of Control!!
Joined: Apr 2019
Posts: 11,921
Likes: 6,769
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
CEL + Codes
Hi all,
First of all, I want to thank you in advance for your help with this matter. I have recently purchased a 2009 S550 from an older gentleman with 82k miles on it. The car had only 1 pervious owner and has an excellent maintenance record.
The problem I am having is that the car started the run erratically all of a sudden. I was driving yesterday and suddenly the car started to misfire and slightly accelerate on its own, then the CEL came on. So I pulled over and noticed that the car revs un-commanded to around 2000 rpms. However, it shifts fine through the gears and responds normally to the brakes. I managed to drive the car home and ran a quick diagnostic and found 5 codes related to the CEL, which two of them indicated O2 sensor Bank 1 and Bank 2 Sensor 1. The icarsoft OBD2 I have was not able to read the other 3 codes. I also ran a manual diagnostic and found a series of current codes including the followings:
-1337
-0217
-1061
-0600
-2313
-6264
-2A23
-9005
-9001
I have cleared the CEL codes and reset the ECU and the car is now running just fine. I wanted to check with you and see if anyone has encountered this in the past or has any idea what this might be. Maybe it is a control unit issue? I have have had a 'Control Unit Performance' CEL light come up in the past along with I believe a 'Control Unit Low voltage' message (I cannot recall the exact message but it was voltage related). Could this be a bad battery? The battery was last replaced in December 2020 at a Mercedes dealership and the brand is DieHard.
Any help with this will be greatly appreciated.
First of all, I want to thank you in advance for your help with this matter. I have recently purchased a 2009 S550 from an older gentleman with 82k miles on it. The car had only 1 pervious owner and has an excellent maintenance record.
The problem I am having is that the car started the run erratically all of a sudden. I was driving yesterday and suddenly the car started to misfire and slightly accelerate on its own, then the CEL came on. So I pulled over and noticed that the car revs un-commanded to around 2000 rpms. However, it shifts fine through the gears and responds normally to the brakes. I managed to drive the car home and ran a quick diagnostic and found 5 codes related to the CEL, which two of them indicated O2 sensor Bank 1 and Bank 2 Sensor 1. The icarsoft OBD2 I have was not able to read the other 3 codes. I also ran a manual diagnostic and found a series of current codes including the followings:
-1337
-0217
-1061
-0600
-2313
-6264
-2A23
-9005
-9001
I have cleared the CEL codes and reset the ECU and the car is now running just fine. I wanted to check with you and see if anyone has encountered this in the past or has any idea what this might be. Maybe it is a control unit issue? I have have had a 'Control Unit Performance' CEL light come up in the past along with I believe a 'Control Unit Low voltage' message (I cannot recall the exact message but it was voltage related). Could this be a bad battery? The battery was last replaced in December 2020 at a Mercedes dealership and the brand is DieHard.
Any help with this will be greatly appreciated.
Can you translate your list of fault codes?
This driveability issue seems related to fuel :
- fuel pump,
- fuel pressure,
- fuel filter,
- pressure regulation,
- saddle pump.
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Thread Starter
Newbie
Joined: May 2022
Posts: 5
Likes: 0
W221 2009 S550
I use a 20 oz plastic bottle of Techron every other month on the first of the month. To get the best effects, I wait until the fuel tank is less than 1/4, add the Techron, drive it to the gas station (about 5 miles) and fill it up with 93 octane. Everyone always tells me additives are B.S., but a number of us have had really good results. I buy Techron by the case of six on Amazon.
Keep us posted on the news.
Keep us posted on the news.
Thread Starter
Newbie
Joined: May 2022
Posts: 5
Likes: 0
W221 2009 S550
@CaliBenzDriver Thank you so much for your reply. Unfortunately, I have deleted the list of codes (my error). I am going to run a fuel cleaner and see if the drivability issue persists. If yes, I will report back and make sure to document the codes properly next time. Thanks again!
