heyhi

I have code po138 which is a 02 sensor. After I change the rear bank upstream sensor how can I clear the check engine light without using a scanner? Will disconnecting the battery work? Also is there anything else that would trip this code I should look for?

Another problem I have is when I hit the gas the rpm will go up and car takes a second to respond. The pickup isn't like it used to be. What could cause that?

DennisMik

iTrader: (2)

Disconnect the battery for 10 minutes. It will also go off by itself (assuming the problem has been fixed) after 2-3 days, depending how and how much you drive.

The other problem could be the MAF.

heyhi

Thanks. Will a pepboys or napa sensor have to be spliced?

Would a vacuum leak cause po138?

george__

iTrader: (1)

if you have a gen 5.5 (2002+), the battery pull method doesn't work.

Google "2002 Nissan Maxima ECU reset" or just drive the car around for a week and the code will disappear automatically

heyhi

What about the loss of power? I cleaned the maf sensor and did Seafoam no difference. It idles good shifts good but after first gear if I slightly punch it , the rpms jump half an rpm or so and it takes a second for the car to accelerate. Happens all the time. Thanks. Its a manual transmission.

Im thinking its not the maf because the idle is fine and it starts rite up.

george__

iTrader: (1)

^
http://forums.maxima.org/5th-generat...af-sensor.html
http://forums.maxima.org/5th-generat...f-5-5-gen.html

heyhi

I've had a maf problem before when in idle the rpm go up n down and when its a stable rpm its really low. Driving the car the car doesn't go past 2nd or 3rd gear. That's not the case.

Its a normal idle. Normal shift. It just takes a split second for the car to respond to acceleration.Happens mostly between 2 and 3000 rpms in any gear past 1st.