Where is the bank 2 o2 sensor located on a 2004 Mazda MPV LX

What engine do you have.

HO2S Heater Control Circuit Low Bank 2 Sensor 1
P0051 Mazda HO2S Heater Control Circuit Low Bank 2 Sensor 1

Four. There are two located before the catalytic converters and two after the catalytic converters.

The are referred to as bank 1 and bank 2 and sensor 1 or sensor two. Bank 1 is always the same side of the engine as the number one cylinder. Bank 2 is the other side. Sensor 1 is always before the catalytic converter. Sensor 2 is after the catalytic converter.

• Bank 1 sensor 1 - same side of the engine as the number one cylinder and before the cat.
• Bank 1 sensor 2 - same side of the engine as number 1 cylinder, after the cat.
• Bank 2 sensor 1 - Opposite side of the engine as the number one cylinder and before the cat.
• Bank 2 sensor 2 - Opposite side of the engine from number 1 cylinder and after the cat.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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disconnect the sensors cancel the codes start engine if the codes don't come back replace sensor

Code 174 means the O2 sensor is telling the computer the fuel mixture on bank two is too lean and the computer can not make the injectors give enough fuel to make it rich.
The problem could be the O2 sensor, or it really could be a fuel problem.
Bank two is the side with cylinder number 2 on a V6 engine.

bank #1is to the left of the engine when looking from the engine to the gearbox,the o2(lambda probe)sensor is on the exhaust down pipe.easier to get to from underneath.it looks like a small 1"round,2"long cigar with a wire on the top.

bank 1 is the bank of cylinders closest to the firewall. the sensor will be located along the exhuast from that side after the catylitic converter

P0031 - most likely pointing to a failed O2 sensor (bank 1 sensor 1 is located before the catalytic converter)

P0421 - failed catalytic converter or a failed O2 sensor

P1512 - intake manifold shutter valve is stuck - may be caused by the O2 sensor, but may not

I recommend replacing your O2 sensor first and see what happens

The firing order is 1-4-2-5-3-6. The cylinders are, front bank is from drivers side to passenger, 6-5-4 , and 3-2-1 at the firewall.