Question about 2002 Mazda MPV
Hi, I got a code on my 2002 MPV and it said heater below threshold bank 2 catalytic converter. Any advice please or diagram? THANK YOU in advance.
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: Check engine light.
ok the bank 1 is where the cilinder one is get a firing order and see where is the number one cylinder that's the bank one
then follow the exaust and replace the sensor after the catalitic
Posted on May 29, 2008
SOURCE: I have a 2004 Mazda
It can be hard to say which it is, because either one will trip the the code, but in this case I'd place my bet on it being the O2 sensor because it says "warm up" - the O2 sensor has to be up to temperature (around 900 degrees) to function. The computer watches for the O2 sensor to heat up in a certain amount of time, and if it doesn't get to temperature soon enough, the computer diagnoses a faulty heater for the O2 sensor and trips the code.
For the record, this would be the secondary O2 sensor, the one after the cat. That's the one that is used to determine cat functionality and efficiency. The primary sensor, before the cat, is used to fine-tune the fuel delivery.
Posted on Aug 08, 2008
SOURCE: Three trouble codes
Trouble Code: P0421
Catalyst Efficiency Below Normal (Bank 1)
Air leaks at the exhaust manifold or in the exhaust pipes
Catalytic converter is contaminated, damaged or has failed
Front HO2S and/or the rear HO2S is loose in the mounting hole
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
Front HO2S or rear HO2S is contaminated with fuel or moisture
Trouble Code: P1173
HO2S-21 (Bank 2 Sensor 1) Circuit Malfunction
Base engine mechanical fault affecting one or more cylinders
EVAP Purge valve stuck or the hoses to the valve are reversed
Fuel metering fault (fuel injector sticking open or leaking)
Fuel pressure too low or too high, fuel supply contaminated
HO2S element is contaminated or the HO2S heater has failed
PCV system has air leaks at the valve or related hoses
Trouble Code: P0174
Adaptive Fuel Trim Too Lean (Bank 2)
Vehicle driven low on fuel or until it ran out of fuel
One or more injectors restricted or pressure regulator has failed
Fuel delivery system supplying too much or too little fuel during cruise or idle periods (e.g., faulty fuel pump, or dirty fuel filter)
Air leaks after the MAF sensor, or air leaks in the PCV system
Air leaks at the EGR gasket, or at the EGR valve diaphragm
Exhaust leaks before or near where the front HO2S is mounted
HO2S is contaminated, deteriorated or it has failed
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
Base engine -mechanical- fault affecting one or more cylinders
Posted on May 18, 2009
Ok the fastest way to solve weather it is the cats in the exhaust system is to take it too a exhaust specialist and ask them to do a exhaust pressure test. They should have all the pressure drop data there and can tell you if there is to much restriction in the exhaust, if there is to much chances are they will be the cats, usually the front one. Yep your dad is correct with his theory, but excessive overfuelling will also cause the cats to build up excess heat and start to melt, or fall apart. So get a good service when your able too, plugs/filters and oils. Yep your firing order is correct.
Posted on Apr 03, 2010
Testimonial: "Good detail, which specifically addressed each part of my question. Advice is directly on point and with layman's terminology. Extremely useful. "
could anyone please help me with this problem that i have with my 2001 mazda protege es 2.0. i have a bad catalyst converter and im waiting for the converter to come in, but before the guys that are fixing on my car relize that i need a converter they put a egr valve and a o2 senor and when the car idle some time it will just die one me. could someone tell me what is going on.
Posted on Dec 24, 2010
Tips for a great answer:
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Apr 05, 2013 | 2003 Mazda MPV
hi,my friend, you can try,
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2), replace if necessary
Replace the catalytic converter
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