If the indicator comes on repeatedly,even though it may go off as youcontinue driving, have the vehiclechecked by your dealer as soon aspossible.If this indicator comes onwhile driving, it means oneof the engine’s emissions controlsystems may have a problem. Eventhough you may feel no difference inyour vehicle’s performance, it canreduce your fuel economy and causeincreased emissions. Continuedoperation may cause serious damage.Your vehicle has certain ‘‘readinesscodes’’ that are part of the on-boarddiagnostics for the emissionssystems. In some states, part of theemissions testing is to make surethese codes are set. If they are notset, the test cannot be completed.If you have recently refueled yourvehicle, the indicator coming oncould be due to a loose or missingfuel fill cap. You will also see a‘‘TIGHTEN FUEL CAP’’ message onthe multi-information display.Tighten the cap until it clicks at leastonce (see page ). Tightening thecap will not turn the indicator offimmediately; it can take several daysof normal driving.If the battery in your vehicle hasbeen disconnected or gone dead,these codes may be erased. It takesseveral days of driving under variousconditions to set the codes again.To check if they are set, turn theignition switch to the ON (II)position, without starting the engine.The malfunction indicator lamp willcome on for 20 seconds. If it thengoes off, the readiness codes are set.If it blinks five times, the readinesscodes are not set. If possible, do nottake your vehicle for an emissionstest until the readiness codes are set.Refer to formore information (see page ).238 355Malfunction Indicator LampReadiness CodeEmissions TestingTaking Care of the Unexpected331If you keep driving with themalf unction indicator lamp on, you candamage your vehicle’s emissionscontrols and engine. Those repairs maynot be covered by your vehicle’swarranties.2008 TL
