OBD-II Code
P1457
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$25–$650
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P1457 is a Toyota and Honda EVAP code for a leak detected specifically on the charcoal canister side of the evaporative emissions system (as opposed to P0442/P0455 which can be anywhere in the system, or P0441 which targets purge flow).
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP1457 is a Toyota and Honda EVAP code for a leak detected specifically on the charcoal canister side of the evaporative emissions system (as opposed…
P1457 is a Toyota and Honda EVAP code for a leak detected specifically on the charcoal canister side of the evaporative emissions system (as opposed to P0442/P0455 which can be anywhere in the system, or P0441 which targets purge flow). The EVAP system pulls a vacuum on the canister and lines using the Vacuum Switching Valve or Canister Vent Valve and watches pressure decay over a calibrated interval; if pressure rises faster than the small-leak threshold (typically equivalent to a 0.020-inch or 0.040-inch hole depending on year), P1457 sets.
Cheapest checks first
- confirm the gas cap seals (replace if the O-ring is hardened, about $15), then visually inspect the canister-side rubber lines and quick-connects for cracks where they pass through the rear subframe or near the fuel tank.
- Use a smoke machine at 0.5 psi maximum injected through the service port and watch for smoke at the canister, vent valve, leak detection pump, or fuel filler neck.
- Live data: monitor the EVAP pressure sensor (Toyota VPMP) during a forced bi-directional canister leak test; healthy systems pull and hold at least -8 inH2O for 30 seconds.
- The expensive misdiagnosis is replacing the entire canister assembly ($300 to $600) when the leak is actually a $20 vent valve seal or a cracked $30 rubber elbow at the top of the canister.
Vehicle-specific patternsToyota 2AZ-FE Camry, RAV4, and Solara (2002-2009) frequently sets P1457 from a failed canister vent valve that sticks open after road salt exposure t…
Toyota 2AZ-FE Camry, RAV4, and Solara (2002-2009) frequently sets P1457 from a failed canister vent valve that sticks open after road salt exposure to the rear underbody. Toyota Prius (2004-2015 NHW20/ZVW30) is notorious for P1457 from a cracked plastic vapor line elbow at the canister, often triggered by rodent damage.
- 2004-2010Toyota Sienna sees P1457 from the canister assembly itself splitting along the molded seam where it mounts above the spare tire well. Honda Civic and CR-V (older OBD-II era through mid-2000s) used P1457 for canister-side leaks where the canister-to-purge line cracks at the rear of the engine bay.
Estimated repair$25 to $650.
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