What Does P1457 Mean?
An electrical fault has been detected in the temperature sensor that monitors the heated catalyst heater power switch on Bank 1. This relates to catalytic converter heating systems used to reduce cold-start emissions.
Common Causes
40%
Faulty catalyst heater temperature sensor Bank 1
30%
Damaged wiring or corroded connector at temperature sensor
20%
Failed heated catalyst power switch or control module
10%
Short circuit or open circuit in sensor signal wire
Diagnostic Steps
1
Step 1: Measure resistance of catalyst heater temperature sensor Bank 1 at various temperatures
2
Step 2: Inspect sensor connector and wiring for damage, corrosion, or moisture intrusion
3
Step 3: Test sensor signal voltage at control module with engine cold and warm
4
Step 4: Check power supply and ground circuits to catalyst heater system
5
Step 5: Verify catalyst heater control module operation using scan tool data
Estimated Repair Cost
$200 - $700
Parts + labor, varies by vehicle and location
An electrical fault has been detected in the temperature sensor that monitors the heated catalyst heater power switch on Bank 1. This relates to catalytic converter heating systems used to reduce cold-start emissions.
The most common cause of P1457 (Heated Catalyst Heater Power Switch Temperature Sensor Electrical (Bank 1)) is: Faulty catalyst heater temperature sensor Bank 1
Typical repair costs for P1457 range from $200 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. Cold-start emissions will be elevated but normal operation is not affected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1457 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
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