2013 C350 Fuel Composition Sensor "Flex fuel sensor"
Thread Starter
Newbie
Joined: Jul 2016
Posts: 2
Likes: 0
From: Katy TX
2013 C350
2013 C350 Fuel Composition Sensor "Flex fuel sensor"
Good morning,
My 2013 C350 is giving me the P0179 code. (fuel composition sensor high input)
Has anyone changed this sensor ?
Where is it located ?
Anyone have a part number ?
Thanks,
Jeff
My 2013 C350 is giving me the P0179 code. (fuel composition sensor high input)
Has anyone changed this sensor ?
Where is it located ?
Anyone have a part number ?
Thanks,
Jeff
Joined: Nov 2016
Posts: 7,847
Likes: 3,498
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Correction. My code was P0178.
Turned out to be water collecting in my driver’s side floorboard after days of rain. The water migrated into the connector of the wires going to the flex fuel sensor. My scanner said the sensor was shorting to ground. When I disconnected the connector, water came out. I blew everything out with compressed air and reconnected everything. I cleared the codes and it didn’t come back. I will post some pics soon.
Turned out to be water collecting in my driver’s side floorboard after days of rain. The water migrated into the connector of the wires going to the flex fuel sensor. My scanner said the sensor was shorting to ground. When I disconnected the connector, water came out. I blew everything out with compressed air and reconnected everything. I cleared the codes and it didn’t come back. I will post some pics soon.
Senior Member
Joined: Jun 2016
Posts: 462
Likes: 152
From: Panama City, FL
2020 C300, 2013 C250, 2000 Boxster S
Correction. My code was P0178.
Turned out to be water collecting in my driver’s side floorboard after days of rain. The water migrated into the connector of the wires going to the flex fuel sensor. My scanner said the sensor was shorting to ground. When I disconnected the connector, water came out. I blew everything out with compressed air and reconnected everything. I cleared the codes and it didn’t come back. I will post some pics soon.
Turned out to be water collecting in my driver’s side floorboard after days of rain. The water migrated into the connector of the wires going to the flex fuel sensor. My scanner said the sensor was shorting to ground. When I disconnected the connector, water came out. I blew everything out with compressed air and reconnected everything. I cleared the codes and it didn’t come back. I will post some pics soon.
Newbie
Joined: Feb 2024
Posts: 7
Likes: 0
2013 C300 w204
Correction. My code was P0178.
Turned out to be water collecting in my driver’s side floorboard after days of rain. The water migrated into the connector of the wires going to the flex fuel sensor. My scanner said the sensor was shorting to ground. When I disconnected the connector, water came out. I blew everything out with compressed air and reconnected everything. I cleared the codes and it didn’t come back. I will post some pics soon.
Turned out to be water collecting in my driver’s side floorboard after days of rain. The water migrated into the connector of the wires going to the flex fuel sensor. My scanner said the sensor was shorting to ground. When I disconnected the connector, water came out. I blew everything out with compressed air and reconnected everything. I cleared the codes and it didn’t come back. I will post some pics soon.
P 0178 code, plus P062B - Internal Control Module Fuel Injector Control Performance. I hope it's just a matter of details of the wires but I'm worried I may have to replace the connector blocks and modules themselves. I just saw your post and haven't taken out the floorboards yet to see.
Can you post pictures of the connectors you had to dry out?
Joined: Nov 2016
Posts: 7,847
Likes: 3,498
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
@JettaRed How did you identify the flex fuel sensor? There was no corrosion anywhere in the connector blocks? My carpet got soaked 2 months ago (then I cleaned my sunroof drains) now I'm getting the
P 0178 code, plus P062B - Internal Control Module Fuel Injector Control Performance. I hope it's just a matter of details of the wires but I'm worried I may have to replace the connector blocks and modules themselves. I just saw your post and haven't taken out the floorboards yet to see.
Can you post pictures of the connectors you had to dry out?
P 0178 code, plus P062B - Internal Control Module Fuel Injector Control Performance. I hope it's just a matter of details of the wires but I'm worried I may have to replace the connector blocks and modules themselves. I just saw your post and haven't taken out the floorboards yet to see.
Can you post pictures of the connectors you had to dry out?
https://mbworld.org/forums/c-class-w...78-solved.html
Newbie
Joined: Feb 2024
Posts: 7
Likes: 0
2013 C300 w204
Sorry, I forgot I had posted that I would post pics. Here's my thread that shows everything.
https://mbworld.org/forums/c-class-w...78-solved.html
https://mbworld.org/forums/c-class-w...78-solved.html
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Joined: Nov 2016
Posts: 7,847
Likes: 3,498
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
@JettaRed Hey, THANKS SO much for meticulously recording and posting all of this invaluable information. So helpful. You've saved people alot of time and money here. Many thanks!
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Super Member
Joined: Apr 2008
Posts: 765
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From: Walnut Creek, CA
325Ci, 325Cic, C300
A few years ago, while tackling corrosion on electrical connectors, I liberally sprayed everything with DeoxIT. Excellent product. It removes all the surface oxidation and coats the contact surfaces with a thin layer of conductive material. You might want to pick up some and treat your connectors.
