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 taking too long to get a signal from the oxygen sensor in the engine. It's like waiting too long for a reply when you ask a question.
The P0133 code indicates that the oxygen sensor in the exhaust system is not responding quickly enough to changes in the air-fuel mixture.
The oxygen sensor (O2 sensor) measures the amount of oxygen in the exhaust gases and sends this information to the engine control module (ECM). The ECM uses this data to adjust the air-fuel mixture for optimal combustion. A slow response from the O2 sensor can lead to inefficient engine performance and increased emissions.
• Check Engine Light is on
• Poor fuel economy
• Rough engine idle
• Faulty oxygen sensor
• Exhaust leaks
• Wiring issues or poor electrical connections
OBD-II: On-Board Diagnostics, a standardized system in vehicles for self-diagnosing and reporting vehicle issues.
ECM: Engine Control Module, the computer that controls engine functions.
• Check for exhaust leaks
• Inspect the wiring and connections to the O2 sensor
• Test the O2 sensor with a multimeter
• Replace the faulty oxygen sensor
• Repair any exhaust leaks
• Fix any wiring or connection issues
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect the exhaust system
• Ensure proper engine maintenance
• Use high-quality fuel
Sensor Issue
• Get the issue diagnosed and repaired promptly to avoid engine damage.
• Monitor fuel economy for any noticeable changes.
Oxygen sensors may be covered under the vehicle's emissions warranty.
This code has been a common issue since the introduction of OBD-II systems, highlighting the importance of the oxygen sensor in emissions control.
Moderate – While the vehicle may still be drivable, it is important to address this issue to maintain fuel efficiency and reduce emissions.
Driving with a faulty oxygen sensor can lead to increased emissions, which may not comply with local environmental regulations.
• Engine at operating temperature
• Vehicle in closed-loop mode
The oxygen sensor is located in the exhaust manifold or exhaust pipe before the catalytic converter on Bank 1.
Q: Can I drive with a P0133 code?
A: Yes, but it's not recommended for long periods as it can lead to poor fuel economy and increased emissions.
Q: How do I know if my O2 sensor is bad?
A: Symptoms include a check engine light, poor fuel economy, and rough idle. An OBD-II scanner can confirm the issue.
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Universal · Digital multimeter
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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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.