OBD-II Code
P0466
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)
$180–$550
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P0466 is the range/performance variant of P0465 — the purge flow sensor signal is in range electrically but doesn't track plausibly against commanded purge duty cycle.
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 procedureP0466 is the range/performance variant of P0465 — the purge flow sensor signal is in range electrically but doesn't track plausibly against commanded…
P0466 is the range/performance variant of P0465 — the purge flow sensor signal is in range electrically but doesn't track plausibly against commanded purge duty cycle. The ECM commands the purge solenoid to open at X% duty and expects the flow sensor to report a corresponding mass flow within Y g/sec tolerance; when actual flow lags, leads, or stays flat relative to commanded duty across multiple drive cycles, P0466 sets.
Cheapest-first ladder
- Datalog purge solenoid duty cycle alongside purge flow sensor voltage during a 15-minute warm drive — they should track linearly, with flow rising 0.5-4.5V across the 0-100 g/sec scale as duty climbs from 0-80%.
- If flow stays at baseline (~0.5V) while duty cycle commands 50%+, the purge solenoid is stuck closed, the line is plugged with canister carbon dust, OR the flow sensor is reading low. Swap test: command purge OFF and squeeze the purge line by hand — you should hear/feel vapor pressure release.
- If flow spikes to 4.0V+ instantly when purge commands 20%, the sensor is reading high or the line has a leak letting unmetered air in.
- Remove the sensor and inspect the hot-wire/element for carbon fouling. Before condemning the purge flow sensor, verify the carbon canister itself isn't saturated with liquid fuel from repeated overfill — saturated canisters dump liquid into the purge line and flood the sensor, which mimics a sensor fault but is actually a tank-vent valve or fuel cap issue ($25 fuel cap fix vs. $400 sensor + canister).
Vehicle-specific patterns2007-2014 Volvo S60/S80/V70/XC90 throws P0466 from the same MAF-routing issue as P0465 — purge mass is measured both at the dedicated sensor and infe…
- 2007-2014Volvo S60/S80/V70/XC90 throws P0466 from the same MAF-routing issue as P0465 — purge mass is measured both at the dedicated sensor and inferred at the MAF, and divergence between the two sets P0466.
- 2011-2017Hyundai Sonata/Elantra/Tucson GDI throws P0466 when the carbon canister saturates and pushes liquid fuel through the purge line; the fix is a new canister plus a check of the tank vent valve operation.
- 2012-2018Kia Optima/Forte GDI shares the Hyundai pattern.
- 2010-2015Chevy Cruze 1.4L turbo throws P0466 from a leaking purge solenoid sealing diaphragm letting unmetered air past the sensor.
Estimated repair$180 to $550.
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