What Does P1196 Mean?
The oxygen sensor heater circuit for Bank 1 Sensor 1 (upstream sensor, engine bank with cylinder #1) has an electrical malfunction. This prevents proper heater operation and sensor warm-up.
Common Causes
40%
Failed Bank 1 Sensor 1 oxygen sensor with heater circuit fault
30%
Open or short circuit in oxygen sensor heater wiring
15%
Blown oxygen sensor heater fuse or failed relay
10%
Corroded or damaged oxygen sensor connector
5%
ECU heater driver circuit failure
Diagnostic Steps
1
Step 1: Check oxygen sensor heater fuse and relay operation
2
Step 2: Disconnect Bank 1 Sensor 1 oxygen sensor and measure heater element resistance (typically 3-30 ohms)
3
Step 3: Verify battery voltage at heater power supply wire with key on
4
Step 4: Check heater ground circuit for continuity and proper connection
5
Step 5: Monitor heater circuit current draw with scan tool or ammeter to verify ECU is commanding heater on
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The oxygen sensor heater circuit for Bank 1 Sensor 1 (upstream sensor, engine bank with cylinder #1) has an electrical malfunction. This prevents proper heater operation and sensor warm-up.
The most common cause of P1196 (O2 Sensor Heater Circ.,Bank1-Sensor1 Electrical Malfunction) is: Failed Bank 1 Sensor 1 oxygen sensor with heater circuit fault
Typical repair costs for P1196 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may experience rough cold starts, increased emissions, and reduced fuel economy until sensor reaches operating temperature.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1196 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System / Emissions Control
Difficulty
Type
Manufacturer
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