Numbered cylinders on a mazda 6 2004 - Mazda Cars & Trucks

check for sticking caliper and or warped /damage rotor

if you buy a set of spark plug leads that are specific to your vehicle they will all be numbered as per cylinder , remove the old ones one at a time and relace with the appropriate new lead

Those numbers on the cap identify which cylinder is connected to which plug wire and in some cases its also the firing order. Usually the firing order is stamped into the top of the intake manifold someplace. You also need to know which direction the rotor is turning in to make sure you get the correct order. Leave the cap off and bump the started to see which direction the rotor turns in and you can work out the firing order from that.

try this
ALLDATA Editor's Note: Always verify #1 cylinder location prior to diagnosis and repair.

- Cylinder bank number one is the bank that contains number one cylinder.


See: Firing Order


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Cylinder #1 on left side.

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Cylinder #1 on right side.

- The first oxygen sensor in cylinder bank # 1 is numbered O2 Sensor 1/1.
- The second oxygen sensor in cylinder bank # 1 is numbered O2 Sensor 1/2.
- A third oxygen sensor in cylinder bank # 1 would be numbered O2 Sensor 1/3.
- The first oxygen sensor in cylinder bank # 2 is numbered O2 Sensor 2/1.
- The second oxygen sensor in cylinder bank # 2 is numbered O2 Sensor 1/1.



- If a V-6 or V-8 vehicle only uses one downstream Heated Oxygen Sensor (HO2S) it is numbered O2 Sensor 1/2, even if it uses two upstream HO2S.
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The #3 cylinder is in the rear bank of cylinders below the windshield. They are numbered from front of engine (by belts) 1 2 3. The front three cylinders nearest the radiator are numbered front front of engine (by belts) 4 5 6.

2.3L 4 cylinder? After removing the plastic engine cover, look at the top of the ignition coil.


It should be numbered 1 through 4.

This is plug number 1 on the engine:


Just wire them 1, 2, 3 and 4 to the corresponding numbers on the ignition coil.

best wishes

here is a picture of the engine cylinder and how they are numbered.

So #4 is the fron left cyinder in the cylinder bank closest to the radiator.

Oxygen sensors are numbered by which bank of cylinders they serve. Bank 1 is the left or drivers side bank of cylinders on the 4.3L which has the odd numbered cylinders 1,3, and 5. Bank 2 is the right or passenger side bank of cylinders numbered 2, 4, and 6. The Bank 1 Sensor 1 would be the sensor for the left hand side of the engine AHEAD of the converter. Bank 1 Sensor 2 is the sensor for the left hand side bank of cylinders BEHIND the converter.

All cars are the same...Number 1 is closest to the fan belt, Number 2 is the next, and so on.

Some cars have 2 oxygen sensors. Your is one of them. Banks are the location that the PCU computer gives.