Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is getting a weak signal from one of the oxygen sensors. It's like trying to listen to a radio station with a lot of static.
The OBD-II code P1205 indicates that the signal from the oxygen sensor located on Bank 2, Sensor 2, is lower than expected during a full load test.
The oxygen sensor (O2 sensor) measures the amount of oxygen in the exhaust gases. This information is used by the engine control module (ECM) to adjust the air-fuel mixture. Bank 2 refers to the side of the engine that does not contain cylinder 1, and Sensor 2 is typically the downstream sensor. A low signal indicates that the sensor might not be functioning correctly, or there could be an issue with the wiring or connections.
• Check Engine Light is on
• Poor fuel economy
• Rough engine idle
• Faulty oxygen sensor
• Wiring issues or poor connections
• Exhaust leaks near the sensor
OBD-II: On-Board Diagnostics, a system for self-diagnosing and reporting vehicle issues.
ECM: Engine Control Module, the computer that controls the engine's functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the oxygen sensor with a multimeter.
• Replace the faulty oxygen sensor.
• Repair or replace damaged wiring or connectors.
• Fix any exhaust leaks near the sensor.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $300
Moderate
• Toyota Camry
• Ford F-150
• Honda Accord
• Regularly inspect and maintain exhaust system.
• Ensure proper engine tune-ups.
• Use quality fuel to prevent sensor contamination.
Sensor Issue
• Avoid driving with the Check Engine Light on for extended periods.
• Have the vehicle inspected by a professional if unsure.
• Regular maintenance can prevent such issues.
Oxygen sensors may be covered under emissions warranty. Check with the manufacturer.
Oxygen sensor issues are common and often result from wear and tear or contamination over time.
Moderate – While not immediately critical, it can lead to increased emissions and reduced fuel efficiency.
Driving with a faulty oxygen sensor can increase emissions, which may not comply with local emissions regulations.
• Engine at operating temperature
• Full load conditions
Bank 2 Sensor 2 is located in the exhaust system, downstream from the catalytic converter on the side of the engine opposite cylinder 1.
Q: Can I drive with a P1205 code?
A: It's possible to drive, but it's not recommended as it can lead to poor fuel economy and increased emissions.
Q: How often should oxygen sensors be replaced?
A: Oxygen sensors typically last between 60,000 to 100,000 miles, but this can vary based on driving conditions and fuel quality.
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Fitment Required · Vehicle-fitment part
Relevant when the code or supporting diagnostics point toward upstream or downstream oxygen-sensor faults.
This code family often involves upstream or downstream oxygen-sensor diagnosis.
Verify exact sensor position and vehicle fitment before buying.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
Catalyst-efficiency faults sometimes point toward converter problems after proper testing.
Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.