Cause
Open circuit in sensor wiring
A break somewhere between sensor and module — a snapped conductor, a terminal backed out of its housing, or a connector that has separated. The module sees no signal at all, which reads identically to a dead sensor, so the wiring is the cheaper half of the diagnosis and belongs first. A resistance check end to end settles it in minutes.
Typically specialist work. Needs equipment or training most home workshops do not have.
Some of these codes mean you should stop driving
39 of the 594 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (594)
Codes where this is a likely explanation first, rather than merely a possible one.
- C0042 Brake Pedal Position Sensor Circuit A Likely for this code Moderate
- C0043 Brake Pedal Position Sensor Circuit B Likely for this code Moderate
- C0076 PWM for Traction Control Likely for this code Moderate
- C0089 TCS Disable Switch Likely for this code Moderate
- P0070 Ambient Air Temperature Sensor Circuit A Likely for this code Low
- P0073 Ambient Air Temperature Sensor Circuit A High Likely for this code Low
- P0095 Intake Air Temperature Sensor 2 Circuit Bank 1 Likely for this code Moderate
- P0098 Intake Air Temperature Sensor 2 Circuit High Bank 1 Likely for this code Moderate
- P0100 Mass or Volume Air Flow Sensor A Circuit Likely for this code High
- P0110 Intake Air Temperature Sensor 1 Circuit Bank 1 Likely for this code Moderate
- P0113 Intake Air Temperature Sensor 1 Circuit High Bank 1 Likely for this code Moderate
- P0115 Engine Coolant Temperature Sensor 1 Circuit Likely for this code High
- P0118 Engine Coolant Temperature Sensor 1 Circuit High Likely for this code High
- P012D Turbocharger/Supercharger Inlet Pressure Sensor A Circuit High Likely for this code Moderate
- P0134 O2 Sensor Circuit No Activity Detected — Bank 1 Sensor 1 Likely for this code Moderate
- P0140 O2 Sensor Circuit No Activity Detected — Bank 1 Sensor 2 Likely for this code Moderate
- P0146 O2 Sensor Circuit No Activity Detected — Bank 1 Sensor 3 Likely for this code Moderate
- P0154 O2 Sensor Circuit No Activity Detected — Bank 2 Sensor 1 Likely for this code Moderate
- P0160 O2 Sensor Circuit No Activity Detected — Bank 2 Sensor 2 Likely for this code Moderate
- P0166 O2 Sensor Circuit No Activity Detected — Bank 2 Sensor 3 Likely for this code Moderate
- P0176 Fuel Composition Sensor Circuit Likely for this code Moderate
- P0179 Fuel Composition Sensor Circuit High Likely for this code Moderate
- P0180 Fuel Temperature Sensor A Circuit Likely for this code Moderate
- P0183 Fuel Temperature Sensor A Circuit High Likely for this code Moderate
- P0185 Fuel Temperature Sensor B Circuit Likely for this code Moderate
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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