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 noticed the oxygen sensor isn't responding quickly enough after the car slows down without using gas.
The P1097 code is triggered when the oxygen sensor on Bank 1 Sensor 2 does not respond fast enough after the engine reduces speed without fuel input.
The oxygen sensor in question is responsible for measuring the amount of oxygen in the exhaust gases. The ECU expects the sensor to show a change in readings quickly after the engine goes into a fuel cut-off mode, such as when coasting. If the sensor is too slow to respond, it triggers this code.
• Check Engine Light is on
• Poor fuel economy
• Rough idle or engine performance issues
• Faulty oxygen sensor
• Wiring issues or poor electrical connections
• Exhaust leaks near the sensor
ECU: Engine Control Unit, the computer that controls the engine's operations.
Bank 1: The side of the engine with cylinder number 1.
• Use an OBD-II scanner to confirm the code.
• Inspect the oxygen sensor and its wiring for damage.
• Check for exhaust leaks near the sensor.
• Replace the faulty oxygen sensor.
• Repair or replace damaged wiring or connectors.
• Fix any exhaust leaks.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $300
Moderate
• Honda Accord
• Toyota Camry
• Ford Focus
• Regularly inspect and maintain oxygen sensors.
• Ensure exhaust system is leak-free.
• Keep electrical connections clean and secure.
Sensor Issue
• Have the vehicle inspected by a professional.
• Do not ignore the Check Engine Light.
• Regular maintenance can prevent this issue.
Oxygen sensors may be covered under the emissions warranty, which typically lasts longer than the standard warranty.
This code has been commonly reported in vehicles with higher mileage where the oxygen sensor may have degraded over time.
Moderate – Driving with this code can lead to increased emissions and reduced fuel efficiency.
Ignoring this code can lead to failing emissions tests and may cause further damage to the vehicle's engine.
• Engine at operating temperature
• Vehicle coasting without throttle input
The oxygen sensor is located on the exhaust system, typically after the catalytic converter on Bank 1.
Q: Can I drive with a P1097 code?
A: It's possible to drive with this code, 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.
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Specialty · Smoke machine
Helpful for finding EVAP and vacuum leaks that are hard to see with visual inspection alone.
Helpful for tracking down EVAP and vacuum leaks that can trigger emissions faults.
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Specialty · O2 sensor socket
Helpful when the code points toward exhaust or oxygen-sensor work and space is tight.
Useful when the diagnosis points toward oxygen-sensor removal or replacement.
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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.