Question about 2004 Toyota 4Runner

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Po442 toyota Code PO442 and PO50 What should I do .

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2003 toyota highlander OBD code's po442/po446/po441

Toyota camry 1999 has engine light on. Diagnostic Code PO441 appears on testing. What does this code m ean for a 99 Camry?

Posted on Mar 01, 2009

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SOURCE: engine light on Codes show

Hello! Those three codes commonly indicate the followi possibilities:

The gas cap was not sufficiently tightenend ater fueling, a bad gas-cap rubber o-ring, the vehicle had the key in the 'on', or engine running, or the tank was filed all of the way up the neck.

Any one of the abope causes will set all three codes.

Posted on Dec 21, 2009

Sheikhtijani
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SOURCE: have po442 and po456. What does this mean?

Hi, both codes mean: Evaporative Emission Control System Leak Detected (very small leak).
This may be a very tough issue to diagnose or it may be a simple problem like a loose gas cap. Check the gas cap, and visually check for any loose hoses under the hood and under the car.
Take care

Posted on Aug 02, 2010

Testimonial: "If it is a loose cap will the check engine light clear automatically? "

daves944
  • 1050 Answers

SOURCE: what is a po442 code?

Small evap leak, often caused by not completely tightening the gas cap. Before you worry to much about this code, clear it and make sure the gas cap is tight each time you fill up. If it comes back after that, you may have to take the car to a shop that has a smoke machine so the system can be leak tested. <!-- from fixya rte -->

Posted on Aug 13, 2010

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SOURCE: Rough ide while in drive:

easy fix..o.k. a P0171 is a lean engine dtc..witch means wrong air fuel mixture..ideal is 14.1 yours is lean...witch means more air than fuel..check to see if there is a intake manifold leak..or vacuum leak.spray small amount of carb cleaner around intake manifold gaskets and see if engine smooths out if it does its a gasket also check for vacuum leaks around air filter rubber snorkle.and all vacuum leaks...if these check out ok...replace the 1st 02 sensor it also controls air and fuel and will cause this issue....as far as a P0442 thats your fuel evap system witch is un related to the first code make shure your fuel cap is tight and sealed...if so replace the evap vent control valve on the canister in the rear by the fuel tank..

Posted on Apr 19, 2011

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That is an emissions code. It means you have a small leak in one of the lines. Most likely it the line that goes from the engine to the evap canister in the drivers side rear inner fender well.

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PO442 --small leak somewhere in EVAP System

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What does codes po442,po442pd and po742 mean


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2003 toyota highlander OBD code's po442/po446/po441


if the air filter was recently inspected or changed, look for the vacuum hose to be disconnected from the valve located on the air filter cover. another source may be the gas cap either loose or with the tether strap caught under it preventing a proper seal

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1 Answer

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Jun 24, 2008 | 2002 Mazda Protege

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