Mechanics

2 CHECK ENGINE CODES PLEASE HELP!

2002 Nissan Sentra • 124,000 miles

Hi, I've been having the same problem with this car for maybe a few weeks now and cant figure out what it is. I checked all the vacumm lines and I cannot find any that are ripped or have come out. Today I cleared the check engine codes to see if anything would come up and to see if they were legit codes. I drove 10 minutes and I got P0420, P01705

2002 nissan sentra gxe 1.8L automatic


THE CAR HAS THE FOLLOWING SYMPTOMS

IDLES UP AND DOWN IN PARK AND NEUTRAL FROM ABOUT 1525-1825 RPM

IDLES HIGH MOST OF THE TIME USUALLY IN PARK AND NEUTRAL IT IDLES STABLE AT AROOUND 1500 RPM

NO POWER. I FLOOR IT AND IT TAKES LIKE 5 SECONDS FOR IT TO PICK UP

SOMETIMES WHEN I PRESS THE GAS IT BOGS DOWN AND ONCE IN A WHILE STALLS BUT USUALLY THE RPM SHOOT UP

THESE ARE THE SYMPTOMS IVE NOTICED. IT JUST STARTED HAPPENING

ONLY THING CHANGES WAS SPARK PLUS WITH NGK IRIDIUMS ABOUT 2 WEEKS AGO BUT THE PROBLEM HAPPENED BEFORE THIS.

please help. Thanks
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Pmp
July 1, 2012.



There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc.

The P1705 will be a TPI switch problem

Mhpautos
Jul 2, 2012.
Ok the p1705. Where is the tps switch. Is there a tps sensor and switch? All I knew about was a sensor with two plugs. Also if there is a switch too where is it? Thanks

Tiny
Pmp
Jul 2, 2012.
It will be in the throttle body.
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Mhpautos
Jul 2, 2012.

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