Testing O2 sensors without a scan tool??
Jan 19, 2005 | 06:37 AM
#1
Testing O2 sensors without a scan tool??
Is this possible to do with a basic volt meter? My wife's Nissan is surging a little and is getting slightly different gas mileage lately. Might just be the fact that it's been around -5 to +10 degrees lately as well. This happened on my 96 truck a while back and it was the O2 sensor. She's got two on the car so I'm thinking on replacing the one closest to the exhaust manifold first. Nissan wants $144.00 each!!!! Napa wants $68 each so I could replace both for less than 1 from Nissan. Some yo yo at the local oil change place told her that when the engine surges a little it could be the mass air meter and she should replace it quick($330.00!!!). I really wish they would stick to oil and lube, my wife seems to think these guys are brainiacs. Now she's got me checking all this stupid crap that is fine, being an engineer and mechanically inclined I think I do a fair job diagnosing problems but man when some dude at the local shop tells her something it the gospil. LOL.
Jan 19, 2005 | 09:39 AM
#3
TECH Resident
iTrader: (2)
Joined: Apr 2004
Posts: 833
Likes: 0
From: in the Trans Am
you can do it with a dvm...you didnt say what year the nissan is but im assuming it has heated o2's(4-wires) first you have to figure out which wires on the sensor are the signal and ground wires..i dont know what color they are on nissans. then take the sensor off the car,and connect the dvm to the sensor wires.
heat the "smart end" with a propane torch (taking away the oxygen "rich") and the voltage should go up to .9 volts in less than a minute.then take away the flame(allowing the sensor to read oxygen"lean") and the sensor should shoot right back to lean which is .1 volts very quickly(around 3 seconds) if not its junk......this is the easiest way i've found.i hope this helps
heat the "smart end" with a propane torch (taking away the oxygen "rich") and the voltage should go up to .9 volts in less than a minute.then take away the flame(allowing the sensor to read oxygen"lean") and the sensor should shoot right back to lean which is .1 volts very quickly(around 3 seconds) if not its junk......this is the easiest way i've found.i hope this helps
Jan 19, 2005 | 03:49 PM
#4
Originally Posted by hondo
you can do it with a dvm...you didnt say what year the nissan is but im assuming it has heated o2's(4-wires) first you have to figure out which wires on the sensor are the signal and ground wires..i dont know what color they are on nissans. then take the sensor off the car,and connect the dvm to the sensor wires.
heat the "smart end" with a propane torch (taking away the oxygen "rich") and the voltage should go up to .9 volts in less than a minute.then take away the flame(allowing the sensor to read oxygen"lean") and the sensor should shoot right back to lean which is .1 volts very quickly(around 3 seconds) if not its junk......this is the easiest way i've found.i hope this helps
heat the "smart end" with a propane torch (taking away the oxygen "rich") and the voltage should go up to .9 volts in less than a minute.then take away the flame(allowing the sensor to read oxygen"lean") and the sensor should shoot right back to lean which is .1 volts very quickly(around 3 seconds) if not its junk......this is the easiest way i've found.i hope this helps
http://www.autozone.com/servlet/UiBr...3d8004f602.jsp
Thread
Thread Starter
Forum
Replies
Last Post
Tydriver
GM Engine & Exhaust Performance
45
Oct 23, 2015 09:19 PM
noproblems209
Tuning, Diagnostics, Electronics, and Wiring
12
Aug 10, 2015 06:57 PM
05GMC4.8
GMT 900 Trucks General Discussion
5
Aug 7, 2015 09:55 PM
