Problem: The vehicle was brought in because the
engine intermittently hesitated and bogged on acceleration. The
MIL (Malfunction Indicator Light) was on. The problem had
occurred only three times before.
Details: The technician retrieved DTCs P0190 –
fuel rail pressure sensor circuit, P2196 – B1S1 O2 sensor stuck
rich and P2198 – B2S2 O2 sensor stuck rich. After reviewing the
live scan tool data, the tech called the Tech-Assist team. The
Tech-Assist consultant suggested checking the EVAP (evaporative)
system for fuel intrusion in the evaporative canister or a
restricted vent valve. He also recommended comparing the
mechanical fuel pressure gauge readings with the scan tool’s fuel
pressure sensor PID.
Confirmed Repair: The technician checked the
EVAP system and confirmed that there was no fuel intrusion in the
evaporative canister and the vent valve was operating correctly.
When he could duplicate the bogging problem, he noticed that the
manual fuel pressure gauge read 100+ psi but the scan tool’s fuel
pressure sensor PID read only 30 psi. The technician replaced the
fuel rail pressure sensor and the problem was resolved.