Ok so I failed emissions, terrible gas mileage, cel on, and a p0138 trouble code. Its obvious I have a bad o2 sensor. It says bank 1 sensor 2.
So my question is, which sensor is this? How do I find it? When I buy a new sensor, Which one do I ask for? Oriely auto parts only has one type listed, are all of my o2 sensors the same? Please help
P0138 1/2 O2 Sensor Shorted To Voltage
answer on another website:
Inspect your wiring harness and sensor ground (Bk/Or).
With a DC voltmeter on the signal wire (Tn/Wt), see if the O2 volts does in fact stay above 1.2 volts. It should slowly walk up and down between ~0.2 - 0.8 volts.
The 'short to voltage' doesn't necessarily mean that you'll see battery voltage here. It simply means that the voltage is higher than allowed.
P0138-1/2 O2 SENSOR SHORTED TO VOLTAGE
When Monitored: With engine running for more than 2 minutes and coolant temperature
above 76°C (170°F).
Set Condition: The oxygen sensor voltage is above 1.2 volts.
O2S SENSOR GROUND CIRCUIT OPEN
O2S SIGNAL CIRCUIT OPEN
O2 SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
WIRING HARNESS INTERMITTENT PROBLEM
Awesome thanks for the help, I will go out and check it now.
alright, voltage too high. I also noticed a golf ball sized hole in my exhaust just after the cat and just before the o2 sensor...could this cause anything?
its the rear one thats bad...how do i know if this is the upstream of downstream?
Upstream is pre-cat, downstream is post-cat.
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