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 there's a problem with the oxygen sensor on one side of the engine. It's like the sensor is sending confusing signals to the car's computer.
The code indicates an issue with the voltage signal from the heated oxygen sensor (HO2S) for Bank 2 Sensor 1, which is not within the expected range.
The P1185 code is triggered when the Powertrain Control Module (PCM) detects that the voltage signal from the heated oxygen sensor (HO2S) for Bank 2 Sensor 1 is outside the normal range. This sensor is responsible for measuring the oxygen level in the exhaust gases, helping the PCM adjust the air-fuel mixture for optimal combustion.
• Check Engine Light illuminated
• Poor fuel economy
• Rough engine idle
• Faulty oxygen sensor
• Wiring issues or poor electrical connections
• Exhaust leaks affecting sensor readings
HO2S: Heated Oxygen Sensor
PCM: Powertrain Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the oxygen sensor's voltage output 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
• Socket set
$150 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain exhaust system.
• Ensure timely replacement of oxygen sensors.
• Check for exhaust leaks periodically.
Sensor Issue
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle for extended periods with this code active.
Oxygen sensors may be covered under the vehicle's emissions warranty.
This code has been associated with sensor failures and wiring issues in various vehicle models over the years.
Moderate – It should be addressed soon to prevent further engine performance issues.
Driving with a faulty oxygen sensor can lead to increased emissions and potential legal issues in areas with strict emissions standards.
• Engine at operating temperature
• Vehicle running at idle
The oxygen sensor is located in the exhaust system, typically near the catalytic converter on Bank 2.
Q: Can I drive with a P1185 code?
A: It's not recommended to drive for long periods with this code, as it can affect fuel efficiency and 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 vehicle maintenance.
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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.