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Results are grouped by useful content—not by paid placement or guessed parts. Describe the symptom naturally; IAR recognizes common alternate wording while keeping exact codes and vehicle details precise.
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Measures intake airflow on systems that use it. Intake integrity and sensor plausibility must be evaluated together.
General knowledgeReports exhaust oxygen behavior for control and monitoring. A lean code does not automatically condemn it.
General knowledgeSupports tire-pressure monitoring. Protocol, frequency, programming, and registration are application-specific.
General knowledgeThe engine turns stored fuel energy into controlled torque. Good diagnosis separates a combustion problem from a mechanical, control, mounting, or support-system problem before parts are removed.
System guideThe charging system supports electrical loads and restores energy to the battery. Modern output can change intentionally, so one voltage reading does not automatically prove an alternator is good or bad.
System guideEmissions systems control combustion byproducts and fuel vapor while monitoring performance. A code reports what a monitor detected; it does not automatically name the part that caused the result.
System guideThe tire is the vehicle's contact with the road. Pressure warnings, vibration, pull, noise, and wear patterns must be interpreted with the vehicle placard, tire condition, wheel mounting, and chassis condition.
System guideThe control system reached a lean-condition diagnostic threshold for Bank 1. The data does not by itself prove a vacuum leak, MAF sensor, or fuel pump.
Generic codeThe control system reached a lean-condition diagnostic threshold for Bank 2. The data does not by itself prove a vacuum leak, MAF sensor, oxygen sensor, or fuel-delivery failure.
Generic codeThe control system reached a rich-condition diagnostic threshold for Bank 1. The data does not by itself prove an injector, fuel-pressure, MAF sensor, or oxygen-sensor failure.
Generic codeThe control system reached a rich-condition diagnostic threshold for Bank 2. The data does not by itself prove an injector, fuel-pressure, MAF sensor, or oxygen-sensor failure.
Generic codeThe control module detected a mass-or-volume-air-flow circuit signal in a low range for its monitoring strategy. The code does not by itself prove a MAF sensor, wiring, connector, intake path, power/ground, or control module is the cause.
Generic codeThe control module detected a mass-or-volume-air-flow circuit signal in a high range for its monitoring strategy. The code does not by itself prove a MAF sensor, wiring, connector, intake path, power/ground, or control module is the cause.
Generic codeThe measured or modeled airflow was outside the expected relationship. The code does not automatically mean the MAF sensor itself failed.
Generic codeThe control module detected coolant-temperature sensor behavior outside the expected range or performance relationship. The code does not by itself prove the sensor, wiring, connector, actual engine temperature, or control strategy as the cause.
Generic codeThe control module detected a coolant-temperature sensor circuit signal in a low range for the vehicle’s monitoring strategy. The code does not by itself prove the sensor, wiring, connector, or engine temperature is the cause.
Generic codeThe control module detected a coolant-temperature sensor circuit signal in a high range for the vehicle’s monitoring strategy. The code does not by itself prove the sensor, wiring, connector, or engine temperature is the cause.
Generic codeThe control module detected intake-air-temperature sensor behavior outside its expected range or relationship. The code does not by itself prove the sensor, wiring, connector, intake condition, or control module is the cause.
Generic codeThe control module detected an intake-air-temperature sensor signal in a low range for its monitoring strategy. The code does not by itself prove the sensor, wiring, connector, intake condition, or control module is the cause.
Generic codeThe control module detected an intake-air-temperature sensor signal in a high range for its monitoring strategy. The code does not by itself prove the sensor, wiring, connector, intake condition, or control module is the cause.
Generic codeThe control module reported a vehicle-speed-signal condition. The standardized code identifies the monitored speed-signal category; it does not prove which sensor, wheel-speed source, wiring path, module, or communication path is responsible.
Generic codeThe control module reported vehicle-speed-signal behavior outside its expected relationship. The standardized code identifies the monitored speed-signal category; it does not prove which sensor, wheel-speed source, wiring path, module, or communication path is responsible.
Generic codeThe control module detected a vehicle-speed-signal input below the range expected by its monitoring strategy. The generic code does not prove which sensor, wheel-speed source, wiring path, module, or communication path is responsible.
Generic codeThe control module detected intermittent, implausible, or high vehicle-speed-signal behavior. The generic code does not prove which sensor, wheel-speed source, wiring path, module, or communication path is responsible.
Generic codeThe control module detected cooling-system temperature behavior outside its expected performance range. The code does not by itself identify a thermostat, coolant-temperature sensor, fan, coolant level, radiator, water pump, or other failed part.
Generic codeThe control module detected a malfunction in the mass-or-volume-air-flow circuit. The code does not by itself identify the sensor, wiring, intake path, power/ground, or control module as the cause.
Generic codeThe catalyst monitor determined that Bank 1 oxygen-storage performance was below its calibrated threshold. The code alone does not prove the converter is the original cause.
Generic codeThe catalyst monitor determined that Bank 2 oxygen-storage performance was below its calibrated threshold. The code alone does not prove the converter is the original cause.
Generic codeThe EVAP monitor detected a small-leak or sealing condition. The code does not identify the physical leak location or prove which component failed.
Generic codeThe EVAP monitor detected a large-leak or inability-to-seal condition. It does not identify where the leak or control fault is located.
Generic codeThe engine did not reach the expected temperature behavior under the monitor’s conditions. The thermostat is one possibility, not the only one.
Generic codeSeparate actual low tire pressure from a TPMS malfunction, sensor, compatibility, registration, or relearn concern.
intermediateAn oil-pressure warning can represent actual lubrication-pressure loss or an electrical/sensor reporting fault. Because real pressure loss can damage an engine quickly, operation safety comes before diagnosis.
professional recommendedSeparate blade and glass conditions from fuse, switch, motor, linkage, washer, wiring, module, and frozen-system evidence while protecting visibility and the windshield.
intermediateUse lamp behavior, symptoms, code status, freeze frame, readiness, and system tests to understand what the vehicle detected without treating a code as a parts order.
beginnerCabin heat complaints can come from engine temperature, coolant level/circulation, airflow, blend-door/control operation, or an electric heat source on some vehicles.
intermediateA sudden loss of steering assist, heavy steering, or a steering control change is a safety-critical handling problem. Stop safely and separate assist supply, electrical/control, hydraulic, tire, and mechanical evidence before any repair decision.
professional recommendedThe traction-control, stability-control, or related chassis-control system has reported a fault, has been switched off, or is actively intervening. The lamp alone does not identify a failed sensor or module.
Assess promptlyThe system may be reporting low tire pressure, a sensor/communication problem, or a relearn/registration condition. Measure the tires before diagnosing electronics.
CautionThe anti-lock braking system has reported a fault or has been disabled. Base braking may behave differently, and the exact effect depends on the vehicle and any other warning lamps.
Assess promptlySeparate actual tire-pressure loss from sensor detection, compatibility, registration, and receiver concerns without guessing a universal relearn process.
Test-first procedureCompare operating pattern, temperature data, and airflow evidence without applying a universal gauge, infrared, or fan rule.
Test-first procedureIAR does not passively record this search. Save feedback only if you want a local note that you can export later for editorial planning. VIN-like vehicle identifiers are redacted before local save.