The TCM is the transmission control module and it has nothing to do with oxygen sensors!
two sensors camshaft and crankshaft if either of the two or both are bad this will cause the stalling.
That Vehicle has 2 oxygen sensors.
2
Four
Four
Exhaust system.
There are two.
2
The oxygen sensors are in the exhaust pipes on most models.
There are four total oxygen sensors. One before and one after the catalytic converter on each side of the engine.
Go to autozone.com type in oxygen sensor and it will allow you to pull up a diagram of all o2 sensors
To replace the oxygen sensors on a 1999 Volvo S80, first, ensure the vehicle is cool and safely elevated. Locate the oxygen sensors, which are typically found on the exhaust manifold and downstream in the exhaust system. Disconnect the electrical connectors and use a specialized oxygen sensor socket to unscrew and remove the old sensors. Install the new sensors by threading them in, tightening them securely, and reconnecting the electrical connectors.