Question about 2001 Nissan Sentra

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I have Nissan 2001, and check the engine light is on for a couple of years, las week the car have failed for the emission test as the rate was 8.6. I took the car to the shop and has changed 2 censors and still couldn't fix the problem. he said this is a obvious computer problem, he could't fixed. thank you so much,

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Sensors do not always fix engines,if he replaced the o2 sensors,they most likely where not the problem,o2 sensors give messages of lean,or rich mixture ,most of the time.Have you tried to clean the upper intake,tuned it up with spark plugs(from a good auto parts,not auto zone ) boots for the coils,and a good fuel injection cleaner,like LUCAS fuel treatment,and new fuel ,and air filter,,?You may need to have the fuel injectors cleaned,with a machine,replace,and check all vacuums,check the mass air flow sensor also,these can all have an effect on the engine emmissions.

Posted on May 13, 2010

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Code P0442-Evaporative emission control system. Canister Purge system failed the monitor test indicating a large leak (over 0.040”). Enabling conditions: Engine running after a 6 to 8 hour engine off period called a cold soak. The test runs when engine load is between 15 to 45% and inlet air temperature between 40 and 130°F. Blocking Action: This code can block the following monitors: Fuel Control, O2 monitor, Catalyst Monitor, misfire monitor. Testing: Check the purge hoses for leaks, leaking vapor management valve or loose gas cap.

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----------- Here is the test that will smoke the system for leaks with a smoke machine.

Evaporative Emission System Leak Test

SPECIAL TOOL(S)

CAUTION: The evaporative emission system must not be pressurized to more than 3.48 kPa (14 inches H2O)or damage to the evaporative emission system may occur.
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  2. Close the canister vent solenoid.
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  5. Repair any leaks as necessary.
  6. Repeat the leak test until the system remains above 2.0 kPa (8 inches H2O) after the two-minute test period.
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