How to install up oxygen sensor 1998 astro van v6

With your does Astro van bank 2 sensor 1 you're talking about the oxygen sensor past the catalytic converter that's how you find

otad doesn't help ---did the trans come out of an 05 astro van s-10 blazer /jimmy s-15 or safari and it your awd because you need to match the rwd with an rwd and a awd with an awd /4wd from above and the unit has to be compatible with the 05

02 sensor is your oxygen sensor, 98 chevy astro carries 3 oxygen sensor. i belived your bad sensor is on the passenger side by the exhaust manifold but if not try the drivers side all the oxygen sensor for this van are the same. you need to go under the van to replace it, if is to hard to get it out turn your van for five minutes then turn it off and try again, be carefull not to burn your self. the one close to the catalytic converter is the downstream oxygen sensor ok, good luck!!!!!!

Which engine do you have? There are at least 2, One upstream and one down stream. The down stream is right after the convertor, and the upstream is on the rear of the motor threaded into the exhaust manifold if you have the 3.3 v6.

need to know if AWD or 2wd and an email address to mail to

same problem with my 98 astro awd they(alighnment shop) did the knock out and solved the problem also check for idler arm wear weak in astro vans replaced mine2 in 5 years

You will end up destroying the transfer case, The transfer case is electronic and not mechanical as the older ones and the speed sensors will throw off the transfer case, if you lose traction to the rear end in the rain, snow or around a corner. The transfer case may activate and deactivate and without the front drive shaft could result in the transfer case to literately explode, also know as grenade. At that point, your looking at a transfer case and may be a transmission. You van runs on RWD unless the rear wheel start to lose traction and then the encoder motor activates the transfer case turning your astro in too a AWD. This was done to save gas, the older AWD transfer case was casing the idle arm to wear out prematurely and the gas economy was 17 MPG and the new AWD system that you have brought the van to 22 MPG. Why do you want to remove it??? if you do i guess you can disconnect the wire harness to the Encoder motor to the transfer case. Good luck and keep me posted.

Assuming...you get the noise with the vehicle moving; try loading up one side at a time by doing lane changes when you hear the grind. If the noise increases & then decreases as you go from side to side then you probably have a bad wheel bearing. Also, You could just have a pebble caught between the backing plate & rotor! (they have a tendency to fall out quickly)

Check your catalitic converter, you might start with an oxygen sensor first. your local muffler shop can do a temp check on the converter for you, but you can replace the oxgen sensor your self pretty easy.

All depends on the 4.3 your going to install. The transmission are the same, that both use the 4L60E. E being that the transmission is controlled by a ECM with the engine. If your running a Aspirated 4.3 and not fuel injected, your going to have to run a 4L60 transmission. 
As for the AWD the new AWD system on the Astro works off the ABS system as it runs on 2WD till the PCM detects the lost of traction then the transfer case is activated by the ECM.
The earlier Astro and Safari AWD 1991 to 1994 had a true AWD and stayed active, but was not that great off road since it had a 40/60 split ratio front to back transfer.
Good luck and hope this helps.