Electrical issues, inc. CEL & Fuel gauge

tmaxx13

New member
So I plugging in my trailer lights into the harness on the 4Runner and it popped the tail light fuse, replaced it and that solved that, jumped in the rig and noticed the fuel gauge was no longer at a 1/4 tank and it was now on E and fuel light was flashing, refueled it and gauge didn't move up, I found that really odd, then after driving 10 miles the CEL light came on and the code is Po171, seems like it could be a verify of issues from what I've googled on that code, any thoughts???

While im on the subject of electrical questions, recently my braking brake light will turn on on the dash without engaging parking break, it started when I was off roading the other day, backing down a hill the brakes got week and holding break to the floor would barely stop it, now the light randomly turns on diving down the road, typically I can lift the parking lever partically up and down a little a few times and it turns off the light, but I would like to try to figure out a better solution.
 
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I know from experience that low brake fluid will cause the light to flicker on and off. Check that and report back. As for the CEL and gas guage, shouldn't be related to the fluid level.
 
I have the same problem with my fuel gauge. The gauge either reads full or empty w/ flashing light. I looked and looked for a bad ground and never found anything. Finally I pulled the dash bulb and now rely on my ultragauge for fuel information. Still looking for the bad ground though...
 

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