frostls400

Lean condition if I researched it right. Some say O2 sensors but which ones? Should I just replace all 4 to be safe or do 2 then reset ECU?

python

iTrader: (4)

front 2 sensors

dicer

Check and test.

frostls400

Front two being upstream correct? And it is a simple resistance check for the O2 sensors right?

oldskewel

iTrader: (1)

Yes, front two are upstream, before the catalytic converter.

A resistance check can tell you the resistance of the heater circuit, but that's not the whole story.

The full test involves accessing the OBD-like connector in the engine compartment, jumpering two pins together, and measuring the voltage at various engine RPM conditions. All spelled out in the manual. And I think there's at least one typo in the manual.

qewani1

don't change sensors/parts before reading their data using a scanner to insure that they are failed to work!