Posted on Jul 24, 2008

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Dash board,head light,tail ligts stays on when engine is off

Its was ok when we went to jersey city but when we came home i saw the engine light on so i used my OBD tester and it appear that the code is P0420 and then i erased the diagnostic trouble code but the problem is when i turn off the engine the dash board,head light,tail lights stays on,i perform the erase diagnostic trouble code but nothing happen the last thing i did is to disconnect the negative cicuit in the battery so it wont discharge the starter,can you please help me with this.

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Anonymous

Toyota Master 1,861 Answers
Posted on Sep 19, 2008

Anonymous

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The P0420 that you are getting may be an inoperative air/fuel sensor (the actual code is "catalyst system efficiency below threshold". This code will not affect the head/tail lamps or dash lights.
You may have a bad headlamp switch.

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