The oxygen sensor on a 1988 Astrovan is located in the exhaust system. There are two oxygen sensors, one on the driver's side and one on the passenger side of the exhaust.
back seat
screwed into exhaust pipe near manifold
The O2 sensor on most cars is somewhere between the air intake and the engine, it is an electrical component which has a wire/wires connected to it.
To change the O2 sensor on a 1996 Oldsmobile 88, first ensure the engine is cool and disconnect the negative battery cable. Locate the O2 sensor, which is typically found on the exhaust pipe or manifold. Use a wrench or O2 sensor socket to unscrew the old sensor, then install the new sensor by threading it into place and tightening it securely. Finally, reconnect the negative battery cable and start the engine to check for any error codes.
On a 1986 Oldsmobile Delta '88, the oxygen (O2) sensor is typically located in the exhaust system, either in the exhaust manifold or just downstream of it, before the catalytic converter. To access it, you may need to raise the vehicle for better visibility. The sensor is usually threaded into the exhaust pipe and can be identified by its electrical connector.
check by the exhaust pipe or catalyst
Depends on what the problem is or what code was set.
the exhaust, where every o2 sensor is
I would start with checking the O2 sensor. It sends a signal to the computer how lean or rich to make the fuel mixture when starting.
The O2 sensor can be found on the outside of the air cleaner housing. The O2 sensor will be attached to the back of the air cleaner housing.
The upstream O2 sensor is mounted in the ehxaust manifold The downstream O2 sensor is mounted in the exhaust pipe after the catalytic converter
The upstream O2 sensor is mounted in the ehxaust manifold The downstream O2 sensor is mounted in the exhaust pipe after the catalytic converter