Question about 2003 Toyota Corolla

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I HAVE A TOYOTA COROLLA 2003,CHECK ENGINE LIGHT, CODE P1780,HOW CAN I FIX IT

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P1780 Is the indication that the neutral safety switch has failed. It is mounted on the side of the transmission where the linkage is attached. replacement is the normal fix. This part is a bit pricey and you might get lucky looking in a salvage yard for a used one.

Posted on May 26, 2011

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  • Toyota Master
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CODE P1780 PARK NEUTRAL POSITION SWITCH OR TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION.

Posted on May 26, 2011

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AFTER REPLACING SWITCH AND COMPUTER ON A 1999 TOYOTA TACOMA P1780 CDE STILL COME BACK


The codes need to reset with a diagnostic plug in device that may only be located at a dealers service center.

Mar 17, 2014 | 1999 Toyota Tacoma PreRunner

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Got missing problem which was fixed after injection coil and one spark plug rusted by water was cleaned but the missing reappears at high speed in my toyota corolla 2003 1.8E. how can i fix it?


These days an engine light mostly should be turned off using either a code reader or a scanner. Some might still turn themselves off when the fault is fixed but that facility tends to be related more to the old days when shorting a couple of obd socket pins would cause the engine light to blink out the codes. In those days disconnecting the battery used to clear the codes and reset the defaults.

Knowing why the engine light is on would be a helpful clue to what sort of things to test and maybe repair or replace and for that a code read is the best way, though a code should never be considered a repair instruction.
Best practice is basics first. A thorough visual check of the engine compartment and ensure the routine maintenance is up to date and competently completed. You know the coil and spark plug has been giving trouble so revisit those items, all of them, for further checking and testing the spark power and quality.

Once you are satisfied all is in order, clear the code and roadtest. If the light comes back on you will need to delve further...

Apr 30, 2017 | 2003 Toyota Corolla

1 Answer

Check engine light on 2003 Corolla Code P0770


Hi toyota ed do you have the emc replacement part number? Thanks

Sep 28, 2012 | 2003 Toyota Corolla

1 Answer

Code P1780 all lights work just trouble light on instrument panel


P1780 TOYOTA - Park Neutral Position Switch Fault

I would suggest you replace that switch on the transmission.

Jun 14, 2012 | Cars & Trucks

1 Answer

2003 toyota corolla catalytic converter


If you want the check engine light to stay off, make sure that the converter is a direct fit, and not a universal. It should work fine then.

Jun 12, 2009 | 2003 Toyota Corolla

1 Answer

How do you reset the check engine light on a 2003 toyota corolla


Disconnect the battery negative cable for 1 min 30 seconds. If it comes back on, a local parts chain store will read your code for free in hopes of selling you the part for the repair.

Mar 12, 2009 | 2003 Toyota Corolla

1 Answer

What'll happen if I dont fix P0420 code in my 2003 Toyota Corolla


in reality nothings happen, and your saying what do you need to do so you will not encounter this problem again well honestly you cant depend on life on catalytic so i suggest to do your general tune up like changing spark plug,wires,check timing,fuel filter,oil change the way they should be change so it helps the engine burn near stoichiometry because during the oxidation happening in your catalytic if your engine rich or lean or misfiring it could cause a defective catalytic converter.

Dec 23, 2008 | 2003 Toyota Corolla

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