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So my legacy should be getting around 20 mpg city but is only getting about 15. It also has the slight smell of gas when you start it first thing in the morning but that goes away after you start driving. I looked around and the most likely suggestion was a bad o2 sensor. What do you all think of this diagnosis or any other ideas? I can answer any questions to help out.

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The check engine light is on however thats registering for bad solenoids in the fuel tank. And i dont know how long since the plugs and wires were replaced, i got it used in october and the guy i got it from didnt change the plugs and he got it to fix and sell. Soooo its probably been a while. Can bad plugs really do all that?

 

And fuel filter??

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Check rear wire harness on back right corner of car has not broken the harness for tank vent valve likes to break there and replace 02 if any doubt 02 controls feul delivery. Had a 99 impreza set codes for tank level senser and tank temp senser changed 02 and code went away was weird linked somehow

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I just checked mileage on my '93 legacy. City is usually 20 mpg, and now it is 15.6 mpg. It's been very cold here, 200 miles north of you (38 days with below-zero ºF temps so far this winter, lowest was -26ºF.) I attribute the loss in mileage to the number of cold starts and warm-up time. After you diagnose/fix the gas smell, check your mileage in spring.

Edited by BB's93LegacyL
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