What Does P1188 Mean?
The compensation resistor circuit in the linear oxygen sensor has a short to ground. This prevents proper oxygen sensor signal correction and affects air-fuel ratio feedback control.
Common Causes
40%
Damaged wiring harness or chafed wires in oxygen sensor circuit grounding out
35%
Failed linear oxygen sensor with internal short circuit
15%
Corroded or damaged oxygen sensor connector pins causing ground path
10%
ECU internal fault in oxygen sensor processing circuit
Diagnostic Steps
1
Step 1: Visually inspect oxygen sensor wiring harness for damage, chafing, or contact with hot exhaust components
2
Step 2: Disconnect oxygen sensor connector and measure resistance between compensation resistor circuit pin and ground (should be high resistance/open)
3
Step 3: Check connector pins for corrosion, bent pins, or moisture intrusion
4
Step 4: If wiring is intact, measure resistance of oxygen sensor compensation resistor per manufacturer specifications
5
Step 5: If all tests pass, suspect ECU issue and perform power cycling or ECU diagnostics
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The compensation resistor circuit in the linear oxygen sensor has a short to ground. This prevents proper oxygen sensor signal correction and affects air-fuel ratio feedback control.
The most common cause of P1188 (Linear 02 Sensor / Compens. Resistor Short to ground) is: Damaged wiring harness or chafed wires in oxygen sensor circuit grounding out
Typical repair costs for P1188 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced fuel economy and increased emissions. Engine performance may be degraded.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1188 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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