I got engine codes 0801 last night. On vbxmaxima web site its say vacuum cut and balve bypass valve? where is thisn part located at?

Plus where cnt i find the front left heated o2 sensor and I how can i replace that? thank you for the helps.

i got a 95 maxima

 

n/m

 

You have a 4Gen Maxima. Your question might get a quicker response if you post it on the 4Gen forum instead of the General forum.

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.

 

Your Maxima has three Oxygen Sensors. Two are front sensors, mounted in
the Y-pipe between the exhaust manifolds and the Catalytic Converter. One
is a rear sensor, mounted in the exhaust pipe downstream of the Cat. The
"front left" sensor is the one which senses the oxygen concentration in the
exhaust stream emitted from the left bank of cylinders. The left bank is
also called the front bank or bank 2. It is cylinders 2, 4, and 6.

This part is accessed from below the car.

The Oxygen Sensors are vital components in the electronic engine management
system. Your engine will continue to run with a bad sensor, but it should
be replaced. A bad sensor causes decreased engine power, increased fuel
usage, increased burden on the Catalytic Converter, and may prevent your car
from passing a smog test.

A replacement Oxygen Sensor costs about $100 and takes one hour of labor to
replace. If you like to do your own "wrenching" you can buy the part for
about $75. This sensor is difficult to reach and you may have to buy a
special socket for your ratchet wrench.

For more information about Oxygen Sensors go to
http://www.volksparts.com/o2sensors.htm

For specific information about replacing Oxygen Sensors on your Maxima see
the Chilton manual (page 4-13) or the Haynes manual (page 6-14).

 

I see what does this part do for the car? Is it important?and how much does it cost to replace?

 

It is part of the Evaporative Emissions Control system. It plays a role in the fuel system leak test performed by the Engine Control Module. It is not important as regards engine operation. It is important as regards vehicle inspection because your car will not pass with the SES light on.

This question can be answered by your dealer.

Don't be too hasty to condemn the valve. Perhaps the wiring is damaged or disconnected. Perhaps the valve can be rejuvenated with a dose of WD-40.