What Does P1458 Mean?
The exhaust gas temperature sensor 2 circuit has a short to ground condition. This sensor monitors exhaust temperature to protect catalytic converters and assist in emissions control strategies.
Common Causes
35%
Damaged exhaust gas temperature sensor 2 with internal short
30%
Chafed or melted wiring harness shorting to exhaust or chassis
20%
Corroded or moisture-damaged sensor connector
10%
Failed engine control module sensor circuit
5%
Damaged sensor mounting causing short through threads
Diagnostic Steps
1
Step 1: Disconnect EGT sensor 2 and measure resistance to ground on sensor side
2
Step 2: Inspect wiring harness near exhaust components for heat damage or chafing
3
Step 3: Check sensor connector for corrosion, moisture, or pin damage
4
Step 4: Measure resistance of sensor at ambient temperature and compare to specifications
5
Step 5: Test ECM sensor circuit by measuring voltage with sensor disconnected
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The exhaust gas temperature sensor 2 circuit has a short to ground condition. This sensor monitors exhaust temperature to protect catalytic converters and assist in emissions control strategies.
The most common cause of P1458 (Exhaust gas temperature sensor 2 short to ground) is: Damaged exhaust gas temperature sensor 2 with internal short
Typical repair costs for P1458 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but engine may enter limp mode to protect catalytic converter from overheating. Monitor for unusual exhaust temperatures.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1458 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
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