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#1
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bad o2 sensor = ??
What does a bad o2 sensor do to performance, specifically HP and gas mileage?
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[/COLOR][/COLOR]-Scott My Locker 2014 Grey Ford Fusion 2.0 EcoBoost Bought: 12-5-14 2005 Silver Legacy GT Ltd 5mt. Bought: 3-3-07 Sold: 12-5-14 1996 Brilliant Red L (AWD). Bought: 6-14-04 - Sold: 3-3-07 - 15.370 @ 89.65 1992 Claret/black LS #4086 (GF's). Bought: 6-30-04 - Sold: 7-29-07 1994 Pearl White LSi Bought: 2001? Sold: 2004? |
#2
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There's a good chance your air-fuel mixture will be "off" - more than likely too rich or too lean. If you see a significant change in your gas mileage the O2 sensor is a good place to start looking.
(better yet-- a bad one should throw a code...)
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Maximum acceleration, maximum lateral g-force...it can be done, it just takes time and $$$ |
#3
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So what kind of code ? My check engine light sometimes would not go on when cold start, but will stay there after the first start-up. I am suspecting it is from O2 sensors....
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#4
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Re: bad o2 sensor = ??
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Typically, a bad O2 sensor will read low (lean), which causes the engine to run too rich, pollute too much and use too much gas. A low reading can be caused by several things: old age, contamination, a bad wiring connection, or an ignition or compression problem in the engine. As an O2 sensor ages, it doesn’t react as quickly as it once did. The increased lag time makes the sensor sluggish and prevents the engine from keeping the air/fuel mixture in close balance. If the engine burns oil or develops an internal coolant leak, the sensor element may become contaminated causing the sensor to fail. Because the sensor reacts to oxygen in the exhaust and not fuel, any engine problem that allows unburned air to pass through the cylinders will also trick an O2 sensor into reading lean. A misfiring spark plug or a leaky exhaust valve - even a leak in the exhaust manifold gasket - may allow enough air into the exhaust to screw up the sensor readings. It won’t damage the sensor, but it will create a rich running condition that hurts emissions and fuel economy. |
#5
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I wonder if my hesitation problems could be because of a bad o2 sensor...the hesitation has gotten much better with the K&N filter for some reason. My CE light did flash twice in the summer for 1 second.
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1993 25th Anniversary Edition # 156 of 301 ~ 121, 488 miles ( SOLD TO svxfiles 8/6/06) 2006 Subaru Impreza 2.5i....5spd - My daily driver 2006 Subaru Legacy 2.5i -7k miles..Mom's daily driver 2,543 Member of the SVX World Network |
#6
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Cool, thanks guys. I had the code read, and it said O2 sensor, that's why i was asking...so i KNOW it's the o2 sensor.
Just wondering what actually happens when it's bad. Now that I think about it, my gas mileage probably is worse. I'm getting about the same miles per tank in my 96 as i was in my 94...but on the 96 all of my miles are highway. Thanks again.
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[/COLOR][/COLOR]-Scott My Locker 2014 Grey Ford Fusion 2.0 EcoBoost Bought: 12-5-14 2005 Silver Legacy GT Ltd 5mt. Bought: 3-3-07 Sold: 12-5-14 1996 Brilliant Red L (AWD). Bought: 6-14-04 - Sold: 3-3-07 - 15.370 @ 89.65 1992 Claret/black LS #4086 (GF's). Bought: 6-30-04 - Sold: 7-29-07 1994 Pearl White LSi Bought: 2001? Sold: 2004? |
#7
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Quote:
You have a '96 SVX with an OBDII system like myself. This code you got for the O2 sensor, is it for one of the front two sensors, or for the third sensor? The front two sensors actively communicate with the ECU to adjust the afr to optimum. The third sensor can be deleted with out having any affect on performance. Several WRX/STI guys have done this with an O2 simulator from Perrin (allows the entire cat to be removed and a straight-pipe installed). -Chike
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#8
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Quote:
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) |
#9
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there is something I cannot understand... I don't have O2 sensors in my car, my gas mileage is very good (16mpg), how come?
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Danny 1994 Silver SVX in hybernation, awaiting for the monsterous awakening (Lebanon) 1967 Mercedes-Benz 250SL Euro Specs, Hard/Softtop, White/Red. Under Complete Restoration 2013 Mercedes-Benz SL350 Euro Specs, White/Red. Mint... Another step into SL Collection. |
#10
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Quote:
i thought it said something to the effect of bank 3 row 1...or row 3 bank 1? i have no idea, ill look tomorrow when i go home.
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[/COLOR][/COLOR]-Scott My Locker 2014 Grey Ford Fusion 2.0 EcoBoost Bought: 12-5-14 2005 Silver Legacy GT Ltd 5mt. Bought: 3-3-07 Sold: 12-5-14 1996 Brilliant Red L (AWD). Bought: 6-14-04 - Sold: 3-3-07 - 15.370 @ 89.65 1992 Claret/black LS #4086 (GF's). Bought: 6-30-04 - Sold: 7-29-07 1994 Pearl White LSi Bought: 2001? Sold: 2004? |
#11
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Quote:
-Chike
__________________
"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#12
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Somtehting else to think about
During lecture today we had a discussion on how pre-OBDII cars ('95 and below) can set an O2 Sensor code because of a failing MAF.
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Last edited by SEA Sleeper; 01-13-2005 at 07:56 PM. |
#13
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Re: Somtehting else to think about
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-Chike P.S. I have to agree, 16 mpg is not good even if you're doing all city driving. Should be at least 3-4 mpg better.
__________________
"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#14
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Those are both reasons why trotting down to the local parts store and buying parts based on the codes pulled are NOT a good idea or in one's best financial interest. Codes are just a starting point in diagnosing a problem.
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) |
#15
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Ok, it was code:
P0145 - O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
__________________
[/COLOR][/COLOR]-Scott My Locker 2014 Grey Ford Fusion 2.0 EcoBoost Bought: 12-5-14 2005 Silver Legacy GT Ltd 5mt. Bought: 3-3-07 Sold: 12-5-14 1996 Brilliant Red L (AWD). Bought: 6-14-04 - Sold: 3-3-07 - 15.370 @ 89.65 1992 Claret/black LS #4086 (GF's). Bought: 6-30-04 - Sold: 7-29-07 1994 Pearl White LSi Bought: 2001? Sold: 2004? |
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