My ford fusion has three O2 which one is heated O2 sensore

Hello again :>D

Question edited to add maker and complete the year.
Question moved to model category.

If you have California emissions, then you will have 3 sensors. If you are getting a P0420 code, you can try changing the upstream sensor first. If you still get a P0420 code, then you will have to replace the manifold/catalytic convertor.

https://www.google.com/search?q=2008+Ford+Fusion+2.3.+Mine+has+3+x+o2+sensors

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On a straight 4, it will have two, one in front of the catalytic converter and one after the catalytic converter. A V6 will have 4, 2 on each bank.

https://www.google.com/search?q=How+many+o2+sensors+does+a+2008+ford+fusion+have

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My database showed two 02 sensors, but, I could be wrong. The 02 sensors are in the exhaust. I looked at info for 2.2L engine.

I would have thought 4 but ask them to show you the exploded parts diagram which shows the five 02 sensors on that engine.

Otherwise the Ford dealer parts guys can pull it up on their computer and verify for you.

Did you replace the right one ? This code does not necessarily mean the O2 sensor is bad . The code description say O2 heater " CIRCUIT " bank 1 sensor 2 Did you check the wiring , the fuse ?
P0141 - O2 Heater Circuit (Bank 1, Sensor 2) Description: See the description for DTC P0135. Possible Causes: See the possible causes for DTC P0135. Diagnostic Aids: See the diagnostic aids for DTC P0135. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test DW . P0135 - O2 Heater Circuit (Bank 1, Sensor 1) Description: During testing the heated oxygen sensor (HO2S) heaters are checked for open and short circuits and excessive current draw. The test fails when the current draw exceeds a calibrated limit or an open or short circuit is detected. Possible Causes:

• Vacuum hose disconnected on exhaust gas recirculation (EGR) system module (ESM) applications
• Short to VPWR in the harness or HO2S
• Water in the harness connector
• Open VPWR circuit
• Open GND circuit
• Low battery voltage
• Corrosion or incorrect harness connections
• Damaged HO2S heater

Diagnostic Aids: Check the HO2S electrical connector for damage, corrosion, and water intrusion.
Damaged HO2S heater. Application Key On Engine Off Key On Engine Running Continuous Memory All GO to Pinpoint Test DW .

Possible causes
- Faulty Front Heated Oxygen Sensor Bank 1
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
Tech notes
Replacing the O2 Sensor 1 usually takes care of the problem

P0132 FORD - O2 Sensor Circuit High Voltage Bank 1 Sensor 1http://engine-codes.com/p0132_ford.htmlForum CodePossible causes- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Front Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
P2195 - O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1

P2196 - O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1

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its maybe the promary oxygen sensor..thanks

The IAT is integrated with the MAF sensor on the 09 Fusion. The MAF is located near the air box on all three engines. on the driver's side, and will be held to some part of the intake tubing by 2 torx screws. http://media.photobucket.com/image/2009%20Fusion%20MAF/itsamecameron/fusion4cylengineMAF.jpg 2.3L shown, 3.0 and 3.5 should be similar.