Vehicle: 2009 Hyundai Santa Fe, FWD, V6-2.7L, Automatic Transmission/Transaxle
Problem: The owner of this Santa Fe complained the engine was hard to start, and the Malfunction Indicator Light (MIL) was on.
Case Details: The technician connected a scan tool and found the following DTCs:
- P2196 - HO2S Signal Stuck Rich (B1S1)
- P2198 - HO2S Signal Stuck Rich (B2S1)
- P2271 - HO2S Signal Stuck Rich (B1S2)
- P2273 - HO2S Signal Stuck Rich (B2S2)
Since all four O2 sensors were stuck rich, the technician began looking for something that would cause such a large amount of fuel to enter the engine. The fuel pressure was within specifications, the fuel injector flow rates were correct, and they were not leaking. An EVAP system inspection uncovered a problem with the purge control solenoid valve (PCSV). It was stuck open, allowing fuel vapors to flood the engine when the engine was off. This caused the hard start condition.
The stuck-open PCSV also skewed the fuel trims because excessive fuel vapors were being pulled into the engine while it was running.
Confirmed Repair: The technician replaced the PCSV, cleared the DTCs and rechecked the oxygen sensor operation with the scan tool. The fuel trims were normal, and the engine started easily. Fixed!
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