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A wet spot under or inside a vehicle does not identify the fluid or failed part. Record where and when it appears, check for safety warnings, and route the evidence to the right system before repair decisions.
beginnerLocate and classify an oil leak, check the immediate safety clues, and separate a visible external leak from oil consumption or another fluid.
General guidanceTreat 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.
intermediateWater inside the cabin after rain, washing, or HVAC use can come from drains, seals, glass, body openings, or condensation. Locate the path before removing trim or blaming a coolant leak.
intermediateClassify smoke or a burning smell by location, color, timing, and nearby systems before attempting another drive or touching a hot component.
intermediateA soft, spongy, low, or sinking pedal can reflect hydraulic leakage or air, master-cylinder or control faults, mechanical adjustment or flex, and other foundation-brake concerns. Braking safety comes before diagnosis.
professional recommendedThe 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 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 generic DTC identifies a vent-control circuit malfunction. It does not identify whether the fault is the vent device, wiring, connector, power/ground, control driver, or another exact-vehicle circuit condition.
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 codeAI guidance is separate from verified IAR sources.
Feedback stays on this device and isn’t sent to IAR. Vehicle identifiers are redacted before saving.