STEP 2. Check the heated oxygen sensor (rear).
(1) Disconnect heated oxygen sensor (rear) connector D-38 and connect test harness special tool, MB991658, to the connector on the heated oxygen sensor (rear) side.
(2) Measure the resistance between heated oxygen sensor connector terminal No. 1 and terminal No. 2.
(3) Standard value: 4.5 - 8.0 Ω [at 20°C (68°F)]
Is the measured resistance between 4.5 and 8.0 Ω [at 20°C (68°F)]?
Go to Step 3. Replace the heated oxygen sensor (rear). Then go to Step 8.