What it does
Reports exhaust oxygen behavior for control and monitoring. A lean code does not automatically condemn it.
A component is one possibility inside a larger system. Confirm its inputs, outputs, connections, and any bounded planning context before replacement.
- 01ObserveReports exhaust oxygen behavior for control and monitoring. A lean code does not automatically condemn it.
- 02Check inputsPower, ground, command, mounting, and conditions
- 03CompareRead companion codes, fuel trims, and operating conditions / Inspect exhaust leaks and circuit integrity
- 04BudgetPricing unavailable · verify locally
- 05DecideReject or support the component cause
- 06VerifyApply the exact repair and recreate the symptom
Follow the sequence, stop when evidence changes the path, and verify the exact vehicle information before acting.
Where it is located
Location and access vary by platform, engine, drivetrain, market, and installed equipment. Identify the exact component using the vehicle’s service information before disconnecting or removing anything.
Symptoms are clues—not proof
Start with the system symptom and operating conditions. A failed connection, control input, related component, incorrect prior repair, or mechanical condition can imitate component failure.
Use the exact safety procedure
Confirm isolation, support, pressure, temperature, and stored-energy hazards for the vehicle before testing.
Testing focus
Read companion codes, fuel trims, and operating conditions
Record the result and compare it only with authoritative information for the exact vehicle and test conditions.
Inspect exhaust leaks and circuit integrity
Record the result and compare it only with authoritative information for the exact vehicle and test conditions.
Compare response to commanded mixture changes when appropriate
Record the result and compare it only with authoritative information for the exact vehicle and test conditions.
Do not condemn the sensor merely because it reports a lean or rich condition
Record the result and compare it only with authoritative information for the exact vehicle and test conditions.
Replacement boundary
IAR does not publish a universal replacement procedure for this component.
IAR has not published a reviewed planning range for this component. Do not infer a repair price from the symptom or component name; verify local labor, parts, and the exact vehicle scope.