I recently pulled some codes from my car, and I was wondering what I would need to test out the specific components related to each malfunction. In addition, estimated parts of price and repair for anyone that had to get it done (or if it is DIY, direct a link where I may be able to do it). Thanks.

P1490 --- 0801 Vacuum cut valve bypass valve
Diagnostic Trouble Code 0801 points to a problem with the Vacuum Cut Valve Bypass Valve. The malfunction is detected when an improper voltage signal is sent to the Engine Control Module through the VCVBV. The possible causes of this problem include a defect with the wiring or electrical connector, or with the valve itself. The VCVBV is located under the car, near the rear left tire. It is near the Evaporative Emission Canister but not mounted directly on it.

The VCVBV is a solenoid-controlled air valve. You may remove it from the vehicle and perform a bench test. There are two air hose nipples on the valve. Fasten a length of clean rubber vacuum tubing to either nipple. Gently blow through the hose. The valve should be closed and it should be difficult or impossible to send air through the valve. Now use a pair of fused test leads to provide 12 volts to the electric connector. The polarity doesn't matter. With the VCVBV solenoid energized the valve should be open and it should be easy to send air through the valve.

P0171 --- 0115 Fuel INJ Sys Right bank:lean
Diagnostic Trouble Code 0115 indicates a problem with the fuel management system on the right cylinder bank. The right bank is also called the rear bank. It is cylinders 1,3,5.

The Front Heated Oxygen Sensor for the right bank sent signals to the Engine Control Module indicating an excessively lean fuel mixture. The ECM attempted to correct this problem by directing the fuel injectors to supply more gasoline. Further signals from the Oxygen Sensor indicate that the attempt to correct the lean mixture condition was unsuccessful, and the fuel mixture continues to be too lean.

Possible causes include ...
- Intake air leaks
- Defective Front Heated Oxygen Sensor
- Fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow Sensor

****For this one, I know that i had a bad O2 sensor, but I was wondering if it would be possible to test the MAF sensor and how much would it be to get a used one.****



P0600 --- 0504 Automatic Transmission Control Unit Signal to ECU
Diagnostic Trouble Code 0504 points to a problem with the Automatic Transmission Communications line. Pulse signals are exchanged between the Engine Control Module and the Transmission Control Module to assure smooth shifting during hard acceleration or deceleration.

This malfunction is detected when the ECM continuously receives an incorrect voltage from the TCM. Possible causes include...
- Harness or connectors (The communications line circuit between the ECM and the TCM is open or shorted.)
- TCM
- Discharged or faulty battery

 

www.alldata.com is amazing for showing you the codes, what they mean, what the possible causes are, and they ways to fix it. The only problem is that you must subscribe to it or have a friend that works in a garage wth the subscprition. A way you can test sensors is to have the car running and unplug them. If nothing happens, then the part is bad. If you have a Haynes manual they show what correct voltages for parts, so testing weith a volt meter is another way.