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Old 06-08-2011, 03:28 PM   #1
alil2cul4u
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Default L200 Fuel Tank Pressure Sensor

We are trying to fix a Saturn L200 we have a CEL P0442. The Fuel Tank Pressure Sensor has been replaced, so has the gas cap. We was told by someone that they could not get a response from the sensor before it was replaced... Has anyone else had any problem like this? If so, how did you fix it?

Thanks,
Julian

Edit: The car is a 2003 L200

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Old 06-08-2011, 10:30 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: L200 Fuel Tank Pressure Sensor

P0442 Evaporative Emission System Leak Detected (small leak)

Usually caused by a loose gas cap. Try wiping the cap seal and filler neck clean and use only an OEM cap. Here are the diagnostic steps if you avoid the simple things to try;

Diagnostic Aids
An EVAP canister purge solenoid valve or EVAP canister vent solenoid valve circuit fault may have caused this DTC to set.
The PCM uses the FTP sensor to detect the amount of vacuum pulled on the EVAP system during the leak diagnostic tests. Ensure that the fuel pressure sensor is not skewed by verifying the FTP sensor on the scan tool is between 2.35-2.85 volts with the ignition ON and the fuel cap removed.
Locate the small leak with the Evaporative Emission System Tester (EEST).
The following are possible causes of a small leak:
  • The fuel cap is leaking.
  • The EVAP canister vent solenoid valve is not seating correctly.
  • The EVAP vent hose is loose or damaged.
  • The EVAP canister is leaking.
  • The fuel sender assembly O-ring is leaking.
  • The fuel tank or filler neck is leaking.
The small leak diagnostic can detect a leak greater than 0.020 of an inch in diameter.
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. By using the scan tool Purge/Seal function to create a vacuum, seal the system and observe the FTP parameter for vacuum decay, this type of leak may be detected.

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

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Old 12-01-2011, 11:29 AM   #3
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Dizzy Re: L200 Fuel Tank Pressure Sensor

Quote:
Originally Posted by alil2cul4u View Post
We are trying to fix a Saturn L200 we have a CEL P0442. The Fuel Tank Pressure Sensor has been replaced, so has the gas cap. We was told by someone that they could not get a response from the sensor before it was replaced... Has anyone else had any problem like this? If so, how did you fix it?

Thanks,
Julian

Edit: The car is a 2003 L200
Slightly different but related: Is it necessary to remove the fuel tank on a 2000S model to make this test ? Or any related code p0442 repairs?
Thanks for your expertise...

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Old 12-01-2011, 01:39 PM   #4
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Default Re: L200 Fuel Tank Pressure Sensor

No tank removal needed. All tests are done automatically by way of OBD II - every vehicle in this country must have its own emission self test done at every engine start up and during a drive. No time limit as OBD II runs self tests continually by first testing things like vacuum or pressure in the sealed fuel system, coolant temperature, every sensor and catalytic converter. If any sensor fails, shorts, opens, leaks vacuum or doesn't measure pressure, OBD II flags it for display as an error code to turn on the SES/CEL/MIL indicator.

A fuel pressure error code may mean a fuel cap is loose as tank pressure is monitored; the fuel cap is similar in construction to radiator/coolant caps - both have a built-in pressure and vacuum relief valve. A failure in one valve or poor seal between the cap and tank can cause either a vacuum or pressure sensor to detect the fault. Its recommended that only OEM fuel caps are used for replacement as aftermarket caps may not have the same ratings as OEM caps. Most errors are with the cap or filler neck causing a leak. Be sure to check cap and neck sealing before embarking on a tortuous route to check every fuel vacuum/pressure line and solenoid valve related to the fuel system. It will not be a walk in the park.

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Old 12-01-2011, 10:45 PM   #5
born again
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2000 L-Series 2.2L Wagon
Default Re: L200 Fuel Tank Pressure Sensor

The most common cause of a P0442 code reported on this site is corrosion of the fuel filler and vent pipes near the right rear wheel, causing perforation and a small vacuum leak. I had this, and replaced the filler neck assembly - code gone.

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