• Check Engine Light is on
• Increased fuel consumption
• Failed emissions test
• Faulty oxygen sensor
• Wiring issues or poor connections
• Exhaust leaks
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
O2 Sensor: Oxygen Sensor
• P0136
• P0137
• P0138
O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
The car's computer isn't getting any signals from one of the oxygen sensors, which helps the car know how much fuel to use.
The P0140 code indicates that the oxygen sensor located after the catalytic converter on bank 1 is not sending any signals to the engine control module (ECM).
The oxygen sensor (O2 sensor) measures the amount of oxygen in the exhaust gases. Bank 1 Sensor 2 is the sensor located after the catalytic converter on the side of the engine with cylinder 1. If the ECM detects no activity from this sensor, it triggers the P0140 code.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections for damage.
• Check for exhaust leaks near the sensor.
• Test the oxygen sensor with a multimeter.
• Replace the faulty oxygen sensor.
• Repair or replace damaged wiring.
• Fix any exhaust leaks.
• Update or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain the exhaust system.
• Perform routine checks on sensor connections.
• Use high-quality fuel to prevent sensor contamination.
Sensor Issue
• Address the issue promptly to avoid increased fuel consumption.
• Consult a professional if unsure about the repair process.
Check your vehicle's warranty for coverage on emissions-related components.
The P0140 code has been a common issue since the introduction of OBD-II systems, often related to sensor wear or wiring issues.
Moderate – While the car may still run, it can lead to increased emissions and fuel consumption.
Driving with a faulty sensor can lead to failed emissions tests and potential fines in areas with strict emissions regulations.
• Engine at operating temperature
• Vehicle running at idle
The oxygen sensor is located on the exhaust pipe after the catalytic converter on the same side as cylinder 1.
Q: Can I drive my car with a P0140 code?
A: Yes, but it's not recommended as it can lead to increased emissions and fuel consumption.
Q: How can I prevent oxygen sensor issues?
A: Regular maintenance and using quality fuel can help prevent sensor issues.
