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Joined: Dec 2000
Posts: 97
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OP
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Joined: Dec 2000
Posts: 97 |
Ok my car is throwing 2 codes, codes 151, and 153, which are: (151)Upstream Heated Oxygen Sensor circuit out of range - Bank No. 2., and (153)Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 2. I assume this means an O2 sensor is dead, is it more than one or does one sensor throw 2 codes. I also noticed my gas mileage dropped dramatically (17mpg on avg). Does anyone know the cost of a new O2 sensor? Or even better, is there a way to "fake out" the O2 sensors so I never have to replace them again?  Thanks!
98 E0 SVT
Frost Silver
No mods...yet.
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Joined: Jul 2000
Posts: 860
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Posts: 860 |
Both codes are from the same O2 sensor. THe upper O2 sensor on the second bank. They aren't that expensive, somewhere in the neighborhood of 50-60$.
This is most definitely your cause for bad gas mileage as of late.
I recommend changing it.
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Joined: Jun 2001
Posts: 3,419
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Posts: 3,419 |
What happens when those codes get thrown is that the PCM uses the one known good one for fuel trim (goes into a semi-open loop mode), and errs on the side of caution, using more gas to ensure the motor doesn't run lean. Hence the lower mileage. You can't fake out the upstream sensor.
Replacing that one isn't so bad, its the one on the radiator side of the engine, closest to the engine. Picking up an O2 socket from an auto parts store will be handy (it has a slot in it to allow the wires to stick out of the socket during removal/install). J-Lab is right about the price, and recommending replacement. Just wait until it is cold, since the manifold and the sensor will be hot (sensor is heated to over 600 degC).
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Joined: Dec 2000
Posts: 97
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OP
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Joined: Dec 2000
Posts: 97 |
you guys are awesome thanks!
98 E0 SVT
Frost Silver
No mods...yet.
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Joined: Jun 2001
Posts: 731
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Just wait until it is cold, since the manifold and the sensor will be hot (sensor is heated to over 600 degC). 600 Degrees Celsius? Wouldn't that be 1112 Deg. Far.? I think that Aluminum melts at about 660 Cel....you sure it gets that hot?
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Joined: Jun 2001
Posts: 3,419
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Joined: Jun 2001
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I checked my Service CD and found the following: Embedded with the sensing element is the HO2S heater. The heating element heats the sensor to temperatures of 800°C (1400°F). At approximately 300°C (600°F) the engine can enter closed loop operation. It just heats the tip to that temp, but you can imagine the rest of the sensor gets quite hot as well.
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Joined: Sep 2000
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Keep in mind that this temperature is at the operating tip of the sensor during operation on a warm engine. It will not be nearly that hot as soon as the engine is shut down. I agree though, you don't wnat to do it when the engine is hot. It can still be hot enough to burn your hands. Wait at least an hour after shutting the engine off.
Jim Johnson
98 SVT
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