Failed battery temperature sensor 2 itself, internal open or short circuit; Damaged or corroded wiring harness between the sensor and the engine control module; Loose or corroded electrical connector at the sensor or at the control module; Faulty heated catalyst control module or relay that shares the sensor circuit; Water intrusion or heat damage affecting the sensor or its wiring near the battery or catalyst; Engine control module software glitch or internal driver fault, though less common

DTC codes / BMW codes / P1464

P1464 · BMWHeated Catalyst Battery Temperature Sensor 2 Electrical

Q: What does code P1464 mean?

Heated Catalyst Battery Temperature Sensor 2 Electrical. P1464 on BMW vehicles indicates that the engine control module has detected an electrical fault in the circuit for the battery temperature sensor associated with the heated catalytic converter system. The computer monitors this sensor's signal to protect the battery and catalyst during the heating phase, and it has logged a value or circuit condition outside the expected range.

P1464 on BMW vehicles indicates that the engine control module has detected an electrical fault in the circuit for the battery temperature sensor associated with the heated catalytic converter system. The computer monitors this sensor's signal to protect the battery and catalyst during the heating phase, and it has logged a value or circuit condition outside the expected range.

SystemPowertrain

Code typeBMW specific

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine performance or power due to the powertrain control module limiting catalyst heating
Slightly increased fuel consumption as the system may default to a conservative strategy
In rare cases, a message related to emissions system service in the iDrive display
Intermittent warning light if the fault is caused by a loose connection or chafed wire

Common causes, most likely first

Failed battery temperature sensor 2 itself, internal open or short circuit
Damaged or corroded wiring harness between the sensor and the engine control module
Loose or corroded electrical connector at the sensor or at the control module
Faulty heated catalyst control module or relay that shares the sensor circuit
Water intrusion or heat damage affecting the sensor or its wiring near the battery or catalyst
Engine control module software glitch or internal driver fault, though less common

How to diagnose and fix it

Use a BMW-specific scan tool to read the freeze frame data and confirm the exact fault condition (open, short, or out-of-range).
Visually inspect the battery temperature sensor 2 and its connector for corrosion, moisture, or physical damage.
Check the sensor's resistance with a multimeter and compare to BMW specifications for the ambient temperature.
Perform a wiggle test on the wiring harness while monitoring live sensor data to detect intermittent faults.
Check for continuity and short-to-ground or short-to-power on the sensor signal and ground circuits.
If the circuit tests good, substitute a known-good sensor and clear the code to see if it returns.
If the fault persists after sensor replacement, diagnose the heated catalyst control module and its power/ground feeds.

Battery sensor faults that mimic catalyst codes

The battery temperature sensor on BMW heated catalyst systems is often integrated into the battery cable or mounted near the battery, so a simple battery replacement can disturb its wiring and set P1464.
A weak or failing battery can cause voltage fluctuations that the control module interprets as a sensor signal fault, so always load-test the battery before condemning the sensor.
P1464 can be stored intermittently by a poor ground connection at the battery tray or chassis, which is easily overlooked during visual inspection.
The heated catalyst system may be disabled by the ECM when this code is active, leading to a secondary catalyst efficiency code if left unrepaired.
Aftermarket batteries with different case dimensions can press on the sensor wiring, causing a short that only appears when the battery is installed.

Can I keep driving with P1464?

You can generally continue driving with P1464, but avoid long periods of idling or heavy load until the fault is repaired, as the heated catalyst may not activate and emissions could increase. Have the circuit inspected soon to prevent secondary catalyst damage.

Tools that help

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Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.