1997 Chevy 2500 3/4 ton van. What are the symptoms for a bad oxygen sensor?

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!!!!!!

Both front oxygen sensors can fail at the same time

If you replace the front or upstream sensors at 100,000
miles, if they haven't failed sooner, your doing preventative
maintenance,so add that to the list

After that they slow down & you don't have the proper control
over the fuel trim & your vehicle is not as sharp in response to
your gas pedal request

The chugging is something you need to look into

The O2 Sensors are not causing that,you got things
that need attention,spark plugs,air filter,clean maf sensor
& check out ignition issues,worn out exhaust converter
causing a partially blocked exhaust system

In the exhaust pipes or exhaust converter
on all vehicles
You will have at least 2 or more
Some veh has 5
All you have to do is get under it & look
not that hard to do or see them

The ground is outside where the tread is, do not worry about ground, when you install it, already grounded

0174 is system too lean, right bank. 0420 is catalyst sytem efficiency below threshold, left bank. fix would be either oxygen sensor or catalytic converter replacement possibly would need both. note: this veh would possibly have up to 4 oxygen sensors, but cause of problem would be the ones coming off manifolds before the catalytic converter possibly in manifold or y-pipe/down pipe.

Google your "year,make,model, engine size, O2 sensor diagram" then click to images

You should change all 4 O2 sensors, it will run better :)

Also check your compression. Not enough compression on any one cylinder will cause oil blow-by and cause it to fail emissions. Also, the EGR valve can cause the same symptoms.

sounds as if you have a power shortage in the van. first establish what fuse keeps blowing this will help in narrowing down the short.once short is located check all connections ,wires,and plugs.

hello, this is an oxygen sensor code, usually replacing the sensor in question solves this, it is caused by low crooss counts by the sensor. good luck, marty

lOOK UNDER THE REAR OF THE VEHICLE ABOVE THE SPARE TIRE ON A CROSSMEMBER BETWEEN THE FRAME RAILS.