P1459 BMW Code - Heated Catalyst Heater Power Supply Open Circuit Bank 2

P1459 indicates an open circuit in the heated catalyst heater power supply for Bank 2, which impacts the catalytic converter's ability to reach and maintain optimal operating temperatures.

Common symptoms include an illuminated check engine light, reduced fuel efficiency, increased emissions, and possible difficulty passing an emissions test.

The code is typically triggered by issues such as damaged wiring, a failed heated catalyst heater, a blown fuse, or a faulty relay associated with the heater circuit.

While it may not directly affect drivability, it can lead to increased emissions, reduced fuel economy, and potential damage to the catalytic converter over time.

Diagnosis involves scanning for fault codes, visually inspecting the wiring and connectors, testing the heated catalyst heater for continuity, and checking the power supply and ground circuits.

Driving for a short period may not cause immediate damage, but prolonged use can harm the catalytic converter and result in higher emissions, so repairs should be addressed promptly.

Repairs may include fixing or replacing damaged wiring, replacing the heated catalyst heater, replacing a blown fuse, or addressing a faulty relay.

Repair costs vary depending on the issue but typically range from $50 to $300 for wiring repairs, and up to $1,000 or more if the heated catalyst or related components need replacement.

A faulty oxygen sensor is not the direct cause of this code but could contribute to similar issues. The P1459 code specifically relates to the heated catalyst heater circuit.

Regularly inspect and maintain the wiring, connectors, and fuses in the heated catalyst heater circuit, and address any electrical issues promptly to prevent future occurrences.