EGR Valve Lift Insufficient Detected
P1491 — EGR Valve Lift Insufficient Detected
System: Powertrain | Type: Manufacturer-Specific | Make: Isuzu
P1491 is a manufacturer-specific powertrain diagnostic trouble code recorded for Isuzu vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.
Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.
P1491 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.
| Code | P1491 |
| System | Powertrain |
| Type | Manufacturer-Specific |
| Make | Isuzu |
| Causes | — |
| Diag. Assistant | — |
| Video | — |
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