Solved: emission test

Wednesday, June 20, 2012

2001 Toyota Avalon: OBD code P0440 & P0442?

Check engine light came on vehicle.
Getting the ECM scanned showed Error codes P0440 and P0442.

Very common fail item for the older Toyota's is a faulty A/F Sensor (aka Oxygen Sensor).

Both P0440 and P0442 codes are related to each other.
Its Emission Leak indication.
DTC P0440 or P0442 is recorded by the ECM when evaporative emissions leak from one of the components or when the vapor pressure sensor malfunctions.
Very commonly, this is a vapor pressure sensor. It should be tested for functionality.
If it passes the test, then you should be looking for a leak in the EVAP (emissions) system. Best way to do this is to have the EVAP System "smoked". This is where a machine forces smoke through the system, and the leak will reveal itself.The Smoke test is done at most auto part garage stores.

For more help,see the parts diagram shown below:----
Toyota parts location

In this type of cases there is no "easy fix". It's a fairly straight forward code. It's either that sensor is faulty, and will need to be replaced, or there is a leak somewhere that will need to be traced and repaired. It can be traced by smoke test or pressure test.
For easy access or stat-up,you can give a visual inspection to the vacuum lines under the vehicle (shown in the image above), however, if nothing jumps out, you'll need to replace the sensor and/or find the leak.One more thing these problems are in a system that will not harm or effect engine performance in any way. Strictly for emissions control to keep the EPA happy. You can "reset" the Check Engine light by removing the "NEG terminal" cable from the battery for 15 minutes, but keep in mind, the light WILL return within 50-75 miles of combined city/highway driving.
But dont Avoid this Problems.

This details will help.
Thanks.

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Tuesday, January 10, 2012

Fail smog test due to gas filter hose?

Check the vacuum hoses and the hose that is on the pressure regulator was off. This hose goes from the pressure regulator to the Gas Filter to the MAP sensor.

The hose from the gas filter on the intake manifold to the pressure regulator will cause the HC to rise. This is due to the higher fuel pressure. Higher fuel pressure can contribute to higher CO readings also, it essentially runs too rich and depending on the condition of your secondary ignition such as spark plug wires and spark plugs you could get incomplete burn and drive up your HC. Make sure your filter is clean and you have good spark plugs and wires. Make sure the oil is clean and the engine is thoroughly warmed up.

There is nature leakage past the rings on a compression and burn in the cylinder. This is called blow by if it is excessive or if the oil is contaminated it contributes to excessive emissions. The blow by is vented through the PCV system and burned and compensated for.

If oil is recently replaced,then no need o replace oil,but if its old,then it has to be replaced.
Running this for 2 months it can contaminate the oil or thin it out and drive up the emissions with the blow by.

This details will help.

Thanks.

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