Applicable Systems
OBD-II
Symptoms
EVAP system pressure sensor signal out of range; ECM cannot monitor EVAP system pressure for leak detection.
Possible Causes
- EVAP pressure sensor internal failure
- Sensor wiring fault
- Sensor blocked by debris
Troubleshooting Steps
- Step 1: Check EVAP pressure sensor voltage at key ON
Voltage within expected range - Step 2: Inspect sensor wiring and connector
Wiring and connector OK - Step 3: Check sensor for physical blockage
Sensor port clear - Step 4: Replace pressure sensor if faulty
New sensor reading normal - Step 5: Clear code and perform EVAP self-test
EVAP test passes
How to Reset
Clear with OBD-II scanner after repair.
Common Replacement Parts
- EVAP Pressure Sensor (OEM spec)
Frequently Asked Questions
- Q: How does EVAP detect leaks?
System seals EVAP, applies vacuum/pressure, then monitors pressure sensor. If pressure drops too fast, leak exists. P0450 means sensor itself is faulty.
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Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
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