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Po442 engine code check engine light on, where do I look for the trouble?

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If u know what the code is U can get a hanes Repair manual at any auto pats stoe and usuall section 6-6 onwadrd will show all code numbers ad what they mean.

Posted on May 04, 2010

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have an auto parts store scan the computer for you.
They most often do this for free (oreilly auto parts and autozone)

Write down the code they give you. Should start with "P" (po442, P1406, etc)

That will be the problem, and they will most likely offer you the part right there.

Toyota is big about EVAP system trouble codes (chech engine lights)

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Check engine lit on code po442,po445


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Failed Emision test


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Check engine light code PO442


You likely won't notice any drivability problems. P0442 indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. 
The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage.
Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

With a P0442, the most common repair is to Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back. Otherwise, replace the gas cap, or Inspect the EVAP system for cuts/holes in tubes/hoses.

Good luck and hope this helps

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Trouble code po442


P0442 onepx.gif EVAP System Small Leak (0.040") Detected


EVAP fuel tank or canister vapor hoses leaking or damaged
EVAP system component leaking, damaged or has failed
Fuel tank cap is loose, or the cap release pressure is incorrect
Leak detection pump damaged or leaking

You can try the gas cap first, if that does not help you will need to take it to a repair shop, Small leaks are very hard to find. If you want to know what turns on the light here it is.

Cold engine startup (ECT sensor from 40-90�F and within 10�F of the BTS input at startup), fuel level more than 1/2 full, engine running, EVAP leak test "on", and the PCM detected a leak greater than 0.040� but less than 0.080" somewhere in the system.
This code sets in 2 Trip(s).

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