Question about Ford Cars & Trucks
Trying to replace sensor 3 oxygen sensor. Found other 2, but can't locate the third. Could you lead me to where I can find it?
Need to know,year,make,model and engine size Megan,then I will send you pictures to where their at .
Posted on Nov 28, 2013
Testimonial: "2003 Ford Focus 2.3L. Pictures would be great! Thanks!"
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Posted on Jan 02, 2017
bank 1 refers to the side of the engine that #1 cylinder is on , and sensor 2 refers to downstream , after the catalytic converter. , this link shows bank 1 on a 2001 nissan maxima V6 being on the firewall side . if you had a 4 cylinder it would be downstream after the catalytic converter .
Posted on Jan 04, 2009
SOURCE: o2 sensor location
DTC P0156 indicates the output voltage of the downstream Heated Oxygen Sensor (HO2S) is less than some calibratable functional window.
The possible causes are:
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Posted on Apr 16, 2009
B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank.
S1 means the sensor is located BEFORE the catalytic converter
S2 means the sensor is located AFTER the catalytic converter
You didn't say which engine you have, so I've included the diagrams of both 4 cyl and 6 cyl so you can see the banks
Posted on Oct 20, 2009
You need to check two things.
First, there is a heat shield on top of the front of the motor where the o2 sensor you already replaced is. It's got (4) 12mm bolts. Remove it and check the exhaust manifold (big thing you put the o2 sensor into) for cracks. If there are any cracks, you'll get o2 sensor codes. Replace the manifold.
Second, if the manifold is fine start the car and listen to the exhaust pipe under the engine for leaks. Or if you already know the exhaust is loud... that's gonna do it too. A leaking exhaust pipe on an Accent will set secondary o2 sensor codes.
SHOULD you try to change it yourself, you will need a 7/8" wrench, and a new o2 sensor, or flex pipe, or manifold depending on what's broke. Do NOT touch the tip of the new or old o2 sensor to ANYTHING when you take it out or install it or it will be ruined permanently. Run the car until it's at it's normal operating temperature. Raise the vehicle, and take the o2 sensor out of the car (see below to understand which one) using the 7/8" wrench or if you got fancy and bought an 02 sensor tool... use it.
Replace whatever parts are bad (manifold or pipe) or just replace the sensor you need. Then restart the car and take it to a parts store and have them clear the code. The code (and check engine light) won't return right away, it usually takes a few days. If you did everything right you should be good. If not, it's not a terribly expensive job to have done and by now you should be able to explain to them what's wrong based on what you found when you looked at the car. Just tell them everything you checked and what you saw.
Education: I'm not sure where that half baked answer about o2 sensor 1 being near cylinder one came from but here's the real deal.
Sensor 1 is always BEFORE the catalytic converter
Sensor 2 is always AFTER the catalytic converter
Bank 1 and Bank 2 refer to which SIDE of the exhaust on 6 and 8 cylinder engines. Bank 1 is usually left side, Bank 2 is usually right side.
So... O2 sensor B1S1 refers to the O2 sensor BEFORE the converter on the LEFT side of the motor.
Posted on Nov 23, 2009
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Chevrolet Impala comes equipped with two oxygen sensors, one on either side of the catalytic converter. Locating the sensors is as simple as crawling under the vehicle.
The bank 1, sensor 2 oxygen sensor is located downstream of the catalytic converter. To get to the sensor, crawl underneath the vehicle and trace the exhaust pipe until you reach the catalytic converter. Continue to follow the exhaust pipe until you reach the bank 1, sensor 2 oxygen sensor.
You should be able to identify the oxygen sensor as a single wire about 3 to 6 inches long. The oxygen sensor is mounted to the exhaust pipe and should slightly protrude from the pipe.
The oxygen sensor is an important part of the vehicle exhaust system. The sensor tests the amount of air in the exhaust stream. It then sends this information to the engine control computer, which determines how much fuel is necessary to maintain a proper air-to-fuel ratio.
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Removal of the oxygen sensor is easier when the engine
temperature is above 48CC
' Handle the oxygen sensors carefully in order to prevent
damage to the component.
Keep the electrical connector and the louvered end free of
contaminants. Do not use
cleaning solvents on the sensor. Do not drop or mishandle
Numbers in ten in parenthesis correspond to numbered
components in image.
1. Raise and support the vehicle.
2. Disconnect the sensor harness connector.
3. Remove the oxygen sensor.
Bank 1 Sensor 2(1)
Bank 1 Sensor 1(2)
Important: A special anti-seize compound is used on the
oxygen sensot threads. The new
service sensors should have the compound already applied to
the threads. Coat the
threads of a reused sensor with anti-seize compound P.N
5613695 or the equivalent.
1. Install the oxygen sensor.
Bank 1 Sensor 2(1)
A Bank sensor (2)
A Bank2Sensorl (3)
A Bank2Sensor2 (4)
Important: Make sure that all of the harness retaining clips
are intact. The harness
must not contact any of the hot exhaust components. The HO2S
pigtail has white
tape at the intervals, indicating the proper location of
each retaining clip. When
connecting the sensor pigtail to the harness, ensure that
the connector seal is
crushed uniformly all the way around between the connectors.
2. Connect the sensor harness connector.
3. Lower the vehicle
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