There are two oxygen sensors in the exhaust behind the engine.
Dozens
use only 2 on the catalyst converter one in front of it and the other one is down
OneOne
The O2 sensors are located on either side of the catalytic converter in the exhaust system.
Code 420 is a catalytic converter efficiency problem. Check cat and also check oxygen sensors.
22
at the end of the manifold just before the cat.
oxygen sensors are located in the exhaust, start at the. exhaust manifold and look down. the funny little thing threaded into the pipe with a wire or three will be the sensor your looking for.
yes.different plugs on several sensors and the plugs going into the pdc and ecu.
Most Neons have two oxygen sensors, one in the exaust manifold directly after the engine, the second is farther along the exaust system after the catalyatic converter. The first oxygen sensor is for the PCM to determine if the engine is running too rich or too lean, the second is primiarly used in order to ensure the catalyatic converter is working correctly.
The oxygen sensor is screwed into the exhaust, behind the engine.