Gas gauge not working
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,562
Likes: 4,034
From: Cape Coral, Florida
If the MIL is illuminated and your gas gauge is not working you’ll need a scan tool to check for any trouble codes…not a fuse !!…you will be looking for P04XX codes.
Team Owner
Joined: Sep 2000
Posts: 25,009
Likes: 2,707
From: Far NW 'burbs of Chicago
St. Jude Donor '13
But don't overdo it. Long ago some BMW's were having a long -forgotten problem. The solution was to add a can of Techron to the gas, some guys went too far with the Techron and the engines started failing. Use a can, drive it out. If still having problems, try another can. But not two cans into the same tank of gas.
Some people will only use Techron before an oil change, so any that gets into the oil from blowby will be removed at the oil change. I don't do that and my oil analysis comes back normal.
Intermediate
Joined: Nov 2025
Posts: 41
Likes: 37
From: Kansas
This weekend while at a road course track I was getting a check engine light (which was clearable) and my gas gauge was showing empty when I know it had gas. I was using 91 octane because I couldn't find 93. The 93 problem is solved, but still wondering about the two issues. Are they truly related, bad/questionable gas causing a dirty sensor?
I had a conversation with a guy at the track and he said the C7s have two tanks, one on the left and one on the right. Gas is pumped between them and there might be related to that.
I did get some Phillips 66 93 for the last session and no check engine light, but gauge still showed empty after a session. The tank was just above half before I started and I probably used about a quarter during the run.
I had a conversation with a guy at the track and he said the C7s have two tanks, one on the left and one on the right. Gas is pumped between them and there might be related to that.
I did get some Phillips 66 93 for the last session and no check engine light, but gauge still showed empty after a session. The tank was just above half before I started and I probably used about a quarter during the run.
