Question about 2000 Toyota Corolla

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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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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.

Posted on Sep 19, 2008

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Posted on Jan 02, 2017

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My 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem?


0 2 sensor near the catalytic converter or

replace the catalytic converter

The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar.

Read more at: https://www.obd-codes.com/p0420
Copyright OBD-Codes.com

https://www.obd-codes.com/p0420

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P0420 code



Trouble Code: P0420

Catalyst System Low Efficiency (Bank 1)
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Air leaks at the exhaust manifold or in the exhaust pipes Base engine problems (i.e., high engine oil or coolant usage.) Catalytic converter is damaged, contaminated or it has failed. Continuous engine misfire conditions, or weak or low coil output. Front HO2S or rear HO2S is contaminated with fuel or moisture. Rear HO2S is loose in the mounting hole (check it for a leak). Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy) .Here is what is listed in the Saturn repair guide.

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TSB Number: 3316 NHTSA Number: 10017210 TSB Date: n/a Date Added to File: October 27, 2005 Failing Component:Electrical System Summary:Diagnostic trouble code P0420 may set on low mileage vehicles, or shortly after catalytic converter replacement
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http://www-odi.nhtsa.dot.gov/cars/problems/tsb/results.cfm?start=1&SearchType=DrillDown&type=VEHICLE&year=2005&make=CHEVROLET&model=COBALT&vehtype=PC&typenum=1&component_id=0&summary=true

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If in fact the fuses are ok then chances are it in the headlamp switch.

You can remove the headlamp switch and using a test light check the wires one at a time while moving the dimmer switch up and down. If you don't find a wire that fades from full bright test light to nothing then the headlight switch needs replaced. If you do find that the dimmer wire is working then chances are you either have a bad ground or a broken wire.

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