OBD-II Code
P0064
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–$620
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
P0064 is the alternate-definition resistance fault on Bank 2 Sensor 3 — some manufacturers map the resistance-plausibility code to P0064 instead of P0061 depending on which monitoring strategy the ECM is using (input vs. output, low-side vs. high-side resistance check).
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 procedureP0064 is the alternate-definition resistance fault on Bank 2 Sensor 3 — some manufacturers map the resistance-plausibility code to P0064 instead of P…
P0064 is the alternate-definition resistance fault on Bank 2 Sensor 3 — some manufacturers map the resistance-plausibility code to P0064 instead of P0061 depending on which monitoring strategy the ECM is using (input vs. output, low-side vs. high-side resistance check).
Diagnostically it's the same flow as P0061
- confirm the vehicle has a Bank 2 Sensor 3 via the FSM exhaust schematic, unplug the connector, measure heater element resistance with a DMM at known ambient temperature (2-15 ohms cold acceptable, most OE sensors at 5-9 ohms, drift to 15-50 ohms before OL is what sets the code), back-probe the supply pin and confirm B+ (12.5-14.0V) with key-on, clamp an inductive ammeter for current draw (0.5-2.0A at 12V is healthy) with engine warm.
- The P0064 code specifically tends to set when the ECM's resistance check is running during a hot-soak condition — meaning the heater element is at peak operating temperature, where thermal expansion in the element shifts resistance out of spec even though the element passes a cold-resistance test.
- Always measure resistance both at ambient AND after a 20-minute hot-soak before clearing the sensor of suspicion.
- The expensive misdiagnosis on P0064: techs perform a cold-resistance test, find the heater in spec at 70F, clear the code, and watch it return after the next hot drive cycle — verify hot resistance as part of the diagnostic before pronouncing the sensor good.
Vehicle-specific patterns2005-2011 Mercedes-Benz M273 5.5L V8 (S550, CL550, ML550, GL550) is the most common P0064 platform alongside P0061 — Mercedes' ECM firmware splits th…
- 2005-2011Mercedes-Benz M273 5.5L V8 (S550, CL550, ML550, GL550) is the most common P0064 platform alongside P0061 — Mercedes' ECM firmware splits the resistance fault between two codes depending on whether the check fails on the cold or hot half of the resistance curve.
- 2003-2010BMW N62 V8 in 750i/Alpina B7 trim sees P0064 specifically on hot-soak conditions where the rear Bank 2 sensor heat-soaks above 600F and the heater element drifts.
- 2008-2013Range Rover 5.0L V8 with the Jaguar AJ-V8 sees P0064 from the same underbody corrosion at the rear sensor connector that triggers P0061.
- 2009-2014Audi RS5 4.2 FSI sees P0064 from heater element thermal fatigue on the secondary cat sensor.
Estimated repair$180 to $620.
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