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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