Wiring or connector fault (corrosion, chafing, poor pin contact) in the heated catalyst power supply or switch control circuit; Low or unstable system voltage from a weak battery, poor battery terminals or a charging system fault; Faulty relay, fuse or power switch feeding the heated catalyst; Heated catalyst heating element failed (short or open circuit) pulling the supply out of range; Poor earth connection affecting the voltage comparison; Internal fault in the control unit output stage or voltage monitoring.

P1467

Heated Catalyst Comparison Battery Voltages of Power Switches Plausibility.

BMW
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
4: AreaAuxiliary emission controls
67: FaultThe specific fault in that area

What it means

P1467 on a BMW means the engine control unit compared the battery voltage seen at the power switches (output stages) that supply the heated catalyst and found the readings did not agree plausibly. It is an electrical plausibility fault in the heated catalyst supply circuit, not a direct measure of catalyst condition. Whether a heated catalyst is fitted, and how the circuit is arranged, depends on the model and engine.

Symptoms

Engine management warning light on
Possibly slightly higher cold-start emissions or a failed emissions test
Other stored faults relating to the heated catalyst or system voltage
Usually no change in how the car drives
Occasionally a blown fuse in the heated catalyst supply

Possible causes

Wiring or connector fault (corrosion, chafing, poor pin contact) in the heated catalyst power supply or switch control circuitlikely
Low or unstable system voltage from a weak battery, poor battery terminals or a charging system faultlikely
Faulty relay, fuse or power switch feeding the heated catalystpossible
Heated catalyst heating element failed (short or open circuit) pulling the supply out of rangepossible
Poor earth connection affecting the voltage comparisonpossible
Internal fault in the control unit output stage or voltage monitoringrare

How to diagnose

Read all stored codes and freeze frame data, noting battery voltage and engine conditions when the fault set, and look for any other voltage or heated catalyst codes.
Test the battery condition, terminal tightness and charging voltage, as low or erratic voltage can cause a plausibility fault.
Check the relevant fuses and relay for the heated catalyst circuit using the wiring diagram for the exact model and engine.
Inspect the wiring and connectors between the control unit, relay and heated catalyst for damage, heat, water ingress and corrosion.
Check the earth points connected to this circuit for cleanliness and tightness.
With the wiring diagram, measure the supply voltage and voltage drop at the heated catalyst connector when the system is commanded on.
Measure the heating element resistance and compare it with the manufacturer specification for that model.
If supply, wiring and element all test good, check control unit supply and output signals before considering the control unit itself.

How to fix

Repair or replace damaged wiring, terminals or connectors, and clean or restore poor earths.
Replace a weak battery or repair the charging system fault as required.
Replace the faulty relay, fuse (after finding the cause of the blow) or power switch.
Replace the heated catalyst or its heating element if it fails the resistance or short-circuit tests.
Repair or replace the control unit only after all other causes are ruled out, and have it coded to the vehicle as required.

Can I keep driving?

Low severity

The car can normally be driven as usual, but book it in soon, as it may fail an emissions test and the circuit fault could worsen. If the engine runs badly or other warnings appear, have it checked sooner.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.