Task: check o2 sensor
Assumptions:
Checking o2 sensor with a clamp meter.
Steps:
Assure the exhaust system on the engine is cold
Turn the clamp-meter on to dc current/dc amperage mode
Put the clamp around either of the oxygen sensor heater power wires
Turn the engine on
Stay updated on the reading
Reading should be between 0.25 and 1.5 amperes.