What Does P1192 Mean?
The downstream oxygen sensor heater circuit has a short circuit condition causing excessive current flow. This can damage the heater circuit and prevent proper sensor operation.
Common Causes
40%
Short circuit in oxygen sensor heater wiring to ground or power
35%
Failed oxygen sensor with internal heater short
15%
Damaged or pinched wiring near exhaust components
10%
Connector pins shorted together due to corrosion or damage
Diagnostic Steps
1
Step 1: Disconnect downstream oxygen sensor connector and check for blown heater fuse
2
Step 2: Measure resistance between heater circuit wires in the harness (should show high resistance with sensor disconnected)
3
Step 3: Measure oxygen sensor heater element resistance at sensor side (should be within specifications, typically 3-30 ohms)
4
Step 4: Inspect wiring harness routing for contact with sharp edges, exhaust heat, or moving components
5
Step 5: Check for voltage drop or excessive current draw when sensor is reconnected using multimeter
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The downstream oxygen sensor heater circuit has a short circuit condition causing excessive current flow. This can damage the heater circuit and prevent proper sensor operation.
The most common cause of P1192 (Oxygen Sensor Heater Circuit Short Downstream) is: Short circuit in oxygen sensor heater wiring to ground or power
Typical repair costs for P1192 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 continued operation may damage ECU heater driver circuit or cause heater fuse to blow repeatedly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1192 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Emissions Control
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
