CEL on wife's Mazda CX-9

Messages
26
Location
New Orleans
My wife called in a panic that her check engine light was on. Luckily, it was on and not flashing so I told her to go ahead and drive home. This morning I hooked up my simple code reader and laptop and pulled the code and information. It shows a P2A04 code. I have never really gotten into working on her Mazda (a 2013 CX-9 with v6 engine), sticking with my older Honda. Anyway, this is the first time I have used this program and maybe I am getting too much information and have no idea where to start. I attached the data from the scanner in hopes that someone here can point me in the right direction to start. Thanks This report is generated on: 2019-5-2 6:19:53 Vehicle VIN: JM3TB2CA9D0407299 Pending DTCs -------------------------- P2A04 O2 Sensor Circuit Range/Performance Bank 2 Sensor 2 Active DTCs -------------------------- P2A04 O2 Sensor Circuit Range/Performance Bank 2 Sensor 2 Freezeframe: 0 DTC: P2A04 -------------------------- FT86 engine oil temperature -40.00 C FT86 engine oil temperature -40.00 F Fuel system 2 status NODATA Fuel system 1 status Closed Calcualted engine load value 61.96 % Engine coolant temperature 80.00 C Engine coolant temperature 176.00 F Short term fuel trim - bank 1 3.13 % Long term fuel trim - bank 1 4.69 % Short term fuel trim - bank 2 1.56 % Long term fuel trim - bank 2 3.91 % Engine rpm 1677.25 RPM Vehicle speed 20.00 KPH Vehicle speed 12.43 MPH Ignition timing advance for cylinder 1 28.50 Deg Intake air temperature 28.00 C Intake air temperature 82.40 F Air flow rate from mass air flow sensor 29.60 g/s Absolute throttle position 22.75 % Oxygen sensor output voltage bank 1 sensor 2 0.12 v Short term fuel trim associated with O2 sensor bank 1 sensor 2 99.22 % Oxygen sensor output voltage bank 2 sensor 2 0.00 v Short term fuel trim associated with O2 sensor bank 2 sensor 2 99.22 % Time since engine start 421.00 sec Commanded Evaporative Purge 25.10 % Fuel Level 92.16 % Number of warm up since DTC cleared 255.00 JK 2012~2017 auto transmission fluid temperature OOR C Distance traveled since DTC cleared 20998.00 KM Distance traveled since DTC cleared 13050.34 Mile EVAP system vapor pressure OOR Pa EVAP system vapor pressure 2.36 Psi Barometric Pressure 96.00 kPa Barometric Pressure 13.92 Psi Oxygen sensor output current bank 1 sensor 1 0.06 mA Oxygen sensor equivalence ratio bank 1 sensor 1 1.02 Air to fuel ratio from wide range oxygen sensor bank 1 sensor 1 15.01 Wide range oxygen sensor output current bank 2 sensor 1 0.05 mA Wide range oxygen sensor equivalence ratio bank 2 sensor 1 1.01 Air to fuel ratio from wide range oxygen sensor bank 2 sensor 1 14.85 Catalyst Temperature Bank 1 Sensor 1 634.30 C Catalyst Temperature Bank 1 Sensor 1 1173.92 F Catalyst Temperature Bank 2 Sensor 1 634.30 C Catalyst Temperature Bank 2 Sensor 1 1173.92 F Control Module Voltage 13.84 V Absolute load value 43.92 % Commanded equivalence ratio 1.02 Relative throttle position 10.20 % Ambient air temperature 28.00 C Ambient air temperature 82.40 F Absolute Throttle Position B 34.51 % Absolute pedal Position D 26.27 % Absolute pedal position E 13.33 % Commanded throttle acuator control 16.08 %
 
Messages
636
Location
Jupiter, FL
Quote
Pending DTCs -------------------------- P2A04 O2 Sensor Circuit Range/Performance Bank 2 Sensor 2 Active DTCs -------------------------- P2A04 O2 Sensor Circuit Range/Performance Bank 2 Sensor 2
Thats all you are looking for, looks like the O2 Sensor on "Bank 2, Sensor 2" which will be the downstream sensor is not functioning properly. It may need to be replaced, you can try clearing the code and see if it comes back. But they are not too expensive on rockauto.
 
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Messages
1,456
Location
Perris, CA
Your freeze frame indicates Bank 2 Sensor 2 is putting out 0 volts. If you've already verified it's plugged in, then it's not working. Or else there's a short in one of the wires, but it's far more likely to be the sensor.
 

podan

Thread starter
Messages
26
Location
New Orleans
Thanks for the information. I noticed the 0.0v as well as the 99% short term fuel trim readings. I am going to get under it tomorrow and try to find the sensor and check the wires. Hopefully it won't be one of those nearly impossible to get out! I've read soaking in PB Blaster and/or heating up the bung with a small torch can help with the stuck in ones.
 
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