Question about 2003 Mazda Tribute
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Posted on Jan 02, 2017
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
bank 2 is the cylinder in the front of the engine compartment near the radiator, the O2 is either in the exhaust manifold of the bank or in the exhaust pipe off the manifold, round about the size of a jumbo magic marker, you need a special O2 sensor socket to remove it in some cases, if it is in the open then a 7/8 open end wrench will work.
Posted on Oct 09, 2009
Testimonial: "Awesome response time, this was exactly the information I needed."
Most of the time the MAF sensor is dirty and needs to be cleaned. Once cleaned the lean condition goes away, try that first before spending crazy money. Good luck and hope this helps. .
Posted on Feb 22, 2010
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
Posted on Apr 01, 2010
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