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2000 Subaru Impreza Bad gas milage

Tiny
ASHER_23
  • MEMBER
  • 2000 SUBARU IMPREZA
  • 199,400 MILES
After purchasing the car I serviced it, change the fuel filter, spark plugs everything. But still having bad gas mileage, after careful observation I found out it didn't have an o2 sensor now I'm realizing that it never had one and I want to get one but I'm learning that I would have to also change the ecu. I have an oil leak at the rear crank seal and valve seals wondering if that is also constituting to the bad gas mileage. I need help desperately. Oh before I forget it's 1.6l sohc engine.
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Monday, September 23rd, 2013 AT 1:53 PM

10 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Is the check engine light on?

Have the codes read and post the NUMBERS here.
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Monday, September 23rd, 2013 AT 2:39 PM
Tiny
ASHER_23
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  • 6 POSTS
Nope there is no check engine light, like I said the car apparently was not made with the o2 sensor so the light would not go on, and yes there is the wire connection to add one.
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Tuesday, September 24th, 2013 AT 7:39 AM
Tiny
WRENCHTECH
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  • 20,761 POSTS
Of course it was made with an 0/2 sensor and yes the light will come on if it's not operating properly unless someone has disabled the light.

Federal law mandates the sensor om a 2000 vehicle
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Tuesday, September 24th, 2013 AT 7:48 AM
Tiny
ASHER_23
  • MEMBER
  • 6 POSTS
Well Maybe they did disable it, but I took off the catalytic converter and there was no bung for the sensor to go into.
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Tuesday, September 24th, 2013 AT 9:22 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Then I don't understand what you're complaining about. You already know the system has been modified.
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Tuesday, September 24th, 2013 AT 9:31 AM
Tiny
ASHER_23
  • MEMBER
  • 6 POSTS
I don't know anything. How can I find out if the if it was disable.
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Tuesday, September 24th, 2013 AT 10:11 AM
Tiny
WRENCHTECH
  • MECHANIC
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Does the check engine light come on for bulb check when the key is turned on but not started?

It really doesn't matter. If the car has no 0/2 sensors, it has no fuel control.
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Tuesday, September 24th, 2013 AT 11:16 AM
Tiny
ASHER_23
  • MEMBER
  • 6 POSTS
Yes it comes on when I turn the key after it's started the light comes off. But if the light is not coming on then how can I check to see if its disable because I intend on buying a sensor and drilling the hole, but I was told also that I may need to change the ecu also; I would hope not.
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Tuesday, September 24th, 2013 AT 11:25 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
No, you are way out in left field here. You need to have a professional look at it.
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Tuesday, September 24th, 2013 AT 11:47 AM
Tiny
ASHER_23
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  • 6 POSTS
Ok thank you for your help.
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Tuesday, September 24th, 2013 AT 12:09 PM

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