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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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Applies controlled pressure to a cool system for leak inspection. Never exceed the specified test pressure.
Specialty toolsCompares cranking pressure under controlled conditions; interpretation depends on engine and test setup.
Diagnostic toolsHelps locate certain intake or EVAP leaks when used at an approved pressure and connection point.
Diagnostic toolsUse controlled pressure on a cool system to investigate leaks without opening a hot, pressurized cooling circuit.
Test-first procedureCompare operating pattern, temperature data, and airflow evidence without applying a universal gauge, infrared, or fan rule.
Test-first procedureCheck whether the vehicle is replenishing electrical energy under its intended operating strategy instead of applying one universal voltage rule.
Test-first procedureSeparate state of charge, battery condition, and connection problems before blaming the starter or alternator.
Test-first procedureSeparate start-request, interlock, cable, ground, solenoid, and starter-motor evidence before bypassing the circuit or replacing the starter.
Test-first procedureSeparate vibration caused by brake application from a shake that follows road speed before choosing a brake, wheel, tire, hub, or suspension path.
Test-first procedureThe cooling system moves heat away from the engine and releases it through controlled coolant flow and airflow. Overheating demands immediate safety judgment before diagnosis.
System guideThe brake system converts motion into heat and controls wheel deceleration. Noise, vibration, pull, warning lamps, and pedal changes require inspection of the whole system rather than one assumed axle or part.
System guideThe fuel system stores and meters fuel under controlled conditions. A no-start, lean code, odor, or hesitation can involve supply, command, air measurement, electrical control, mechanical condition, or vapor management.
System guideHVAC comfort depends on airflow, heat exchange, temperature control, doors, sensors, and—for air conditioning—a sealed refrigerant system. Warm air alone does not identify a failed compressor.
System guideThe 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 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 generic EVAP monitor reported a system-level malfunction. The code identifies the monitored emissions system, not a failed cap, valve, hose, canister, sensor, or other specific part.
Generic codeThe generic EVAP monitor detected purge-flow behavior outside its expected strategy. The code does not prove the purge valve itself is failed; the flow path, sealing, sensing, electrical control, and vehicle-specific monitor conditions still have to be tested.
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 very small leak or inability to maintain the expected seal. The code does not identify the leak location or prove a specific valve, cap, hose, or canister failed.
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 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 system may be reporting low tire pressure, a sensor/communication problem, or a relearn/registration condition. Measure the tires before diagnosing electronics.
CautionThe engine or cooling system is reporting excessive temperature or a related protection condition. The warning does not identify whether the cause is coolant loss, airflow, circulation, control, or internal leakage.
Stop and assessThe 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 promptlyTreat active hot coolant loss as a burn and overheating hazard, then inspect the cooled system to separate external leakage, cap/sealing concerns, trapped air, and possible internal loss.
intermediateTreat overheating as a stop-and-assess condition, then separate coolant loss, airflow, circulation, control, and combustion concerns.
professional recommendedCabin heat complaints can come from engine temperature, coolant level/circulation, airflow, blend-door/control operation, or an electric heat source on some vehicles.
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