What Does P1459 Mean?
An open circuit has been detected in the power supply to the heated catalyst heater on Bank 2. This prevents the catalytic converter heating element from receiving power to accelerate warm-up.
Common Causes
30%
Blown fuse or fusible link in catalyst heater circuit
25%
Open circuit in power supply wiring to heater element
25%
Failed catalyst heater relay or control module
15%
Corroded or loose connections at heater power terminals
5%
Failed heated catalyst element with open circuit
Diagnostic Steps
1
Step 1: Check catalyst heater fuse and fusible links for continuity
2
Step 2: Test voltage at catalyst heater power supply connector during heater activation
3
Step 3: Verify catalyst heater relay operation and measure coil and contact resistance
4
Step 4: Inspect power supply wiring and connections for opens, damage, or corrosion
5
Step 5: Measure resistance of catalyst heater element if accessible
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
An open circuit has been detected in the power supply to the heated catalyst heater on Bank 2. This prevents the catalytic converter heating element from receiving power to accelerate warm-up.
The most common cause of P1459 (Heated Catalyst Heater Power Supply Open Circuit (Bank 2)) is: Blown fuse or fusible link in catalyst heater circuit
Typical repair costs for P1459 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. Cold-start emissions will be higher than designed but normal driving is unaffected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1459 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
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