Where are the catalytic converters located

The catalytic converter is the first bulbous box past the exhaust manifold.

2003 Ford Focus: The catalytic converter needs to be ...

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Jun 1, 2009 - I have seen a catalytic converter only (no pipes), a catalytic converter with a pipe that bolts onto the manifold? and other variations. Which ...

1 answer · Top answer: Hi, Ok, you have one converter, which bolts to the end of the exhaust [/topics-exhaust-ford/] ...
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It looks like this

https://www.carparts.com/catalytic-converter/ford/focus/2003

The 2004 Ford Freestar SEL is equipped with a V6 engine, and it typically has two heated oxygen sensors (HO2S) due to its dual exhaust system. These sensors are also commonly referred to as oxygen sensors or O2 sensors. The specific details may vary depending on the exact engine and exhaust configuration of your vehicle.

1. Bank 1 Sensor 1 (B1S1): This is the upstream oxygen sensor located before the catalytic converter on the side of the engine where cylinder 1 is located. It monitors the oxygen content in the exhaust gases before they enter the catalytic converter.
2. Bank 2 Sensor 1 (B2S1): This is the upstream oxygen sensor located before the catalytic converter on the side of the engine where cylinder 2 is located. Similar to B1S1, it monitors the oxygen content in the exhaust gases before they reach the catalytic converter.

These sensors play a crucial role in monitoring the air-fuel mixture and helping the engine control module (ECM) adjust fuel delivery for optimal performance and emissions.
Please note that vehicle specifications can vary, and it's always best to refer to your vehicle's owner's manual or consult with a qualified mechanic to get accurate and specific information about the number and location of oxygen sensors in your particular 2004 Ford Freestar SEL.

You have remove Catalytic Converter and Engine mountes to get to the Starter.
This is the procedure

1. Disconnect and isolate the negative battery cable.
2. Remove the catalytic converter (3) See: Engine, Cooling and Exhaust\Exhaust System\Catalytic Converter\Service and Repair\Catalytic Converter - Removal.
3. Remove the front engine mount through bolt.
4. Remove the retainers (2) from the front engine mount bracket (1) and remove the bracket.
5. Remove the field generator connector (1).
6. Remove the B+ retainer (2) and B+ cable (3).
7. Remove the stater retainers (1).
8. Remove the starter (2).

I’m happy to assist further over the phone at https://www.6ya.com/expert/uttamjeet_2f3adc18600f8ede

Four .
Heated Oxygen Sensor (HO2S Bank 1 Position 1)
Located in RH front pipe of the exhaust catalytic converter
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Engine Controls Connector End Views in Engine Controls
Heated Oxygen Sensor (HO2S Bank 1 Position 2)
Located in RH rear pipe of the exhaust catalytic converter
--
Engine Controls Connector End Views in Engine Controls
Heated Oxygen Sensor (HO2S Bank 2 Position 1)
Located in LH front pipe of the exhaust catalytic converter
--
Engine Controls Connector End Views in Engine Controls
Heated Oxygen Sensor (HO2S Bank 2 Position 2)
Located in LH rear pipe of the exhaust catalytic converter

Bank 1 Sensor 3 is the post converter sensor.



Hope this helps (remember to rate this answer).

Possible O2 sensors:

P2270 O2 Sensor Signal Stuck Lean Bank 1 Sensor 2
P2271 O2 Sensor Signal Stuck Rich Bank 1 Sensor 2
P2272 O2 Sensor Signal Stuck Lean Bank 2 Sensor 2
P2273 O2 Sensor Signal Stuck Rich Bank 2 Sensor 2
P2274 O2 Sensor Signal Stuck Lean Bank 1 Sensor 3
P2275 O2 Sensor Signal Stuck Rich Bank 1 Sensor 3
P2276 O2 Sensor Signal Stuck Lean Bank 2 Sensor 3
P2277 O2 Sensor Signal Stuck Rich Bank 2 Sensor 3
P2278 O2 Sensor Signals Swapped Bank 1 Sensor 3 / Bank 2 Sensor 3
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This is Bank 1 (closer to the dash panel) Sensor 2 (located after the catalytic converter).

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Note: A malfunctioning front oxygen sensor may cause fuel trim codes to set.

1. Several Diagnostic Trouble Codes use specific terminology to refer to sensor location. The illustration and key below explain the following terms:
2. Engine BANK Bank 1 is closer to the dash panel, (also referred to as RH or right hand). Bank 2 is closer to the radiator, (also referred to as LH or left hand).
3. UP Refers to Sensor 1 or "front sensor". It is located closer to the exhaust manifold and before the catalytic converter.
4. DOWN Refers to Sensor 2 or "rear sensor." It is located after the catalytic converter.
5. The following examples show how to interpret oxygen sensor terminology:
6. B1/S1 = Bank 1/Sensor 1 = Dash panel side, BEFORE the catalyst or "upstream"
7. B2/S2 = Bank 2/Sensor 2 = Radiator side, AFTER the catalyst or "downstream"

Those codes don't indicate a failure of any particular sensor. They are codes for the bank 1 and bank 2 catalytic converters. The computer uses the oxygen sensors in front of and behind the catalytic converters to determine how well the converters are working. If the efficiency of the converters go below a specific threshold the computer will set the codes you got. Common repairs for this code include replacement of the catalytic converters (most common), failure of the front o2 sensors (slow switching rate) or a computer reprogram.

They are on the exhaust up front
On a V8 you have a left and a right bank O2 sensor

On the SOHC engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On the DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the catalytic converter.

Oxygen sensor location-Baja 2.5L SOHC engine


Oxygen sensor location-Baja 2.5L DOHC engine



On the 2.0L engine the front (A/F) oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter.

Oxygen sensor location-Impreza 1998-2001 2.2L engine



Oxygen sensor location-Impreza 1998-2002 2.5L SOHC engine

I hope helped with this; remember rated this help. Good luck.