I have 2003 ford focus dohc. part of exhaust system fell off. from back to front I have 1. tail pipe 2. rectangular box shaped part 3. missing part

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

Hi Dennis Monahan, I want to help answer 3 , usa only.
well no engine option told,
USA car others outside had more engines,
we can not guess, country engine or VIN
sorry, no can do.
all cars with v6 or v8 have
3 or 4 sensors.(O2)
one on each cat front (2) 1 per bank,
B1S1, B2S1, those are called.
and 1 rear in Y pipe (yes" or 2 rear(no).
the 1or2 rear are not used to tune injection mixtures, the rear or for CAT tests only.
my guess is ,this, USA spec, EPA allowed engine. got AWD?

3.0 L Duratec 30 V6

here is the whole walker kit set, 1 photo and bingo USA car.?

the front two 02 sets fuel mix
the rear only does P0420, cat monitor test
not told why asking.?
but for better fuel economy on super high mileage engines.
the 2 front are it.

to learn this read the factory service manual
or at rockauto.com read there see what your car has. free.
answer 3.

Starting from the front, coming off the exhaust manifold should have, 1. Exhaust pipe, 2. Catalytic converter, 3. Exhaust pipe, 4. Resonator, 5. Tail pipe. Also, there should be an Oxygen sensor somewhere around the catalytic converter.

I see a visit to a muffler shop in your future. Find an independent privately owned shop, not a chain operated place. They'll be better and cheaper than a chain shop

Resonator is usually half way under the car,is that missing?

SECTION 309-00: Exhaust System 2003 Focus Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 01/24/2003 Exhaust System Printable View (214 KB) Vehicles with 2.0L Zetec-E engine
Item Part Number Description 1 - Bracket 2 - Gasket 3 - Catalytic converter 4 - Bracket 5 - Gasket 6 - Front muffler 7 - Rear muffler 8 - Hanger 9 - Flexible pipe

Vehicles with 2.0L SPI engine
Item Part Number Description 1 - Gasket 2 - Catalytic converter 3 - Bracket 4 - Gasket 5 - Front muffler 6 - Rear muffler 7 - Hanger 8 - Bracket 9 - Flexible pipe

Vehicles with 2.3L PZEV Engine
Item Part Number Description 1 5G232 Catalytic converter 2 5K222 Mounting bracket 3 5K282 Head shield 4 9451 Gasket 5 5A262 Insulator 6 5E292 Converter and muffler assembly 7 9448 Gasket 8 5G203 Flex Pipe NOTE: The exhaust systems shown in this section are production systems.
The exhaust systems are of a two-piece construction for production and five-piece construction for service.
Catalytic Converter
The catalytic converter fitted to the Focus range resembles a small muffler. Because of the high temperatures at which the catalytic converter operates, the vehicle body areas around the catalytic converter are protected by heat shields. The catalytic converter controls three emissions; Hydro carbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOx).
Catalyst deactivation due to poisoning
Sulphur (S) in the fuel can cause deactivation of the catalyst.
Lead (Pb) in fuel can cause a severe deactivation at levels above 5 mg per liter of fuel. It is therefore essential that vehicles with catalytic converters always operate on unleaded fuel.
Zinc (Zn) and phosphorus (P) present in some oils, can cause deactivation if oil consumption is high.
The effect of sulphur is felt most if it is released from the catalytic converter as hydrogen sulphide (H2S). This has an unpleasant odor similar to rotten eggs. Changing the fuel manufacturer may help in reducing this phenomena.
To minimize H2S emissions, it is essential that the idle CO level is within specification and that the engine emission system is functioning correctly. For additional information, refer to Section 303-08A or Section 303-08B.
CAUTION: If temperatures exceeding 900°C are achieved the catalyst substrates will start to deteriorate. It is important that the cause is defined and rectified if subsequent melts are to be prevented.
Catalyst melts are normally accompanied by loss of power due to excessive back pressure. For additional information, refer to Section 303-07A or Section 303-07B.
High substrate temperatures are caused by the ignition or the fuel systems. For additional information, refer to Section 303-07A or Section 303-07B.
Misfires at high engine speed may result in an almost instantaneous melt.

There are 4 oxygen sensors on the Windstars They are divided into 2 banks of 2.
- Bank 1 is the for the rear 3 cylinders of the engine
- Bank 2 is for the front 3 cylinders.

Bank 1 / Sensor 1 (upstream) is located just below, in the pipe, the exhaust manifold on the back of the engine.

REMOVE TIP: you may have to bend part of the transmission heat shield out of the way - be sure to put it back when done.

Bank 1 Sensor 2 (downstream) is located just past the drivers side catalytic converter. Bank 2 Sensor 1 (upstream) is located just below the exhaust manifold, in the pipe, at the front of the van - access is from the top. Bank 2 Sensor 2 (downstream) sensor is located just past the passenger side catalytic converter.

NOTES: * Use lots of penetrating oil - allow to soak - to make removal easier and avoid damaging the exhaust pipe

* The sensors are screwed directly into the pipe at a 90 degree angle and look like spark plugs with either 8", 12", or 14" wires attached to them




Hope this heslps (remember tp rate this answer).

2 O2 sensors and 2 catalytic converter efficiency monitors, they look like O2 sensors but are not, they are after the cat converters, the O2's are before the cat converters in the exhaust pipe of the engine exhaust manifolds

recharge what system if ur refering to ac it will be the big hose/pipe comming from condenser the can looking thing should have 2 hoses comming out of it follow ur lones comming from ac comp itself and find the bigger one its like 1/2 inch or so maybe 1inch but any way the gauage will only fit on one start the car fell the hose see if it gets cold and its probably the one