P0191moderate severityPowertrain
Fuel Rail Pressure Sensor Circuit Range/Performance
on 2004 Isuzu Ascender 4.2L I6 · 4WD
What this code means
The fuel rail pressure sensor reading is out of expected range.
Symptoms
- Check Engine Light
- Engine surge
- Poor performance
Common causes
- Sensor fault
- Fuel pressure issue
- Restricted fuel line
Diagnostic steps
- Compare sensor to mechanical gauge
- Check fuel pump
- Inspect fuel lines
Repair notes
Replace sensor or repair fuel system.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1