DTC P2196:00, P2198:00 [MZI-3.7]: Notes
WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & POSSIBLE CAUSE
DTC P2196:00
DTC P2198:00 |
P2196:00: A/F sensor (RH) signal stuck rich
P2198:00: A/F sensor (LH) signal stuck rich |
| DETECTION CONDITION |
- P2196:00 indicates that A/F sensor (RH) signal is stuck rich
- P2198:00 indicates that A/F sensor (LH) signal is stuck rich
- A HO2S indicating rich at the end of a test is trying to correct for an over-lean condition The test fails when the fuel control system no longer detects switching for a calibrated amount of time
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| POSSIBLE CAUSE |
Electrical System:
- Short to power supply in wiring harness or A/F sensor
- Water in wiring harness connector
- Open/shorted A/F sensor circuit
- Open circuit in A/F sensor pumping current circuit
- Corrosion or poor mating terminals and wiring
- Damaged A/F sensor
- Damaged HO2S
- Damaged PCM
Fuel System:
- Restricted fuel pressure regulator/fuel supply line
- Ethanol content in fuel
- Excessive fuel pressure
- Vapor recovery system
- Leaking fuel injectors
Intake Air System:
- Vacuum Leaks
- Positive crankcase ventilation (PCV) system
- Incorrectly seated engine oil dipstick
- Air leaks after the mass air flow (MAF) sensor
Base Engine:
- Exhaust leaks before or near the HO2S(s)
- Oil overfill
- Cam Timing
- Cylinder compression
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