What Does P2479 Mean?
The exhaust gas temperature at Bank 1, Sensor 2 (typically post-catalyst or pre-DPF) is outside expected range. This sensor monitors catalyst efficiency and DPF regeneration conditions.
Common Causes
38%
Defective EGT sensor providing false readings
28%
Catalyst or DPF failure affecting exhaust temperatures
18%
Exhaust leak between sensor 1 and sensor 2
10%
Failed DPF regeneration cycles causing abnormal temperatures
6%
Wiring issues or sensor contamination from coolant/oil
Diagnostic Steps
1
Step 1: Compare Bank 1 Sensor 2 EGT readings with Sensor 1 to assess catalyst temperature drop
2
Step 2: Inspect exhaust system between sensors for leaks or damage
3
Step 3: Review DPF regeneration history and soot load percentage
4
Step 4: Test EGT sensor resistance and voltage response against specifications
5
Step 5: Perform backpressure test if DPF restriction is suspected
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The exhaust gas temperature at Bank 1, Sensor 2 (typically post-catalyst or pre-DPF) is outside expected range. This sensor monitors catalyst efficiency and DPF regeneration conditions.
The most common cause of P2479 (Exhaust Gas Temperature Out of Range Bank 1 Sensor 2) is: Defective EGT sensor providing false readings
Typical repair costs for P2479 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe for short-term driving. Prolonged operation may damage DPF or catalyst, leading to expensive repairs and potential engine protection mode activation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2479 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
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