brylew

I just threw a p0420 (Catalytic converter efficiency Bank 1) and i wanted to test my O2 sensors. Does anyone have the resistances that Sensor 1 and Sensor 2 should be??

1996 4Runner 4x4 4cylinder (3RZ)

Thanks in advance for the Help!

BajaRunner

INSPECTION
1. INSPECT HEATER RESISTANCE OF HEATED OXYGEN
SENSOR
(a) Disconnect the sensor connector.
(b) Using an ohmmeter, measure the resistance between terminals
+B and HT.
Resistance:
at 20°C (68°F) 11 – 16 ohms
at 800°C (1,472°F) 23 – 32 ohms
If the resistance is not as specified, replace the sensor.
Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)
(c) Reconnect the oxygen sensor connector.

jason191918

http://www.ncttora.com/fsm/2003/Repa...3/hos/insp.pdf

http://www.ncttora.com/fsm/2003/Repa...e3/cip0136.pdf

this help?

jason191918

maaaaaaaaaan. he beat me to it.

Welcome to YT!



There, beat him to that.

brylew

So what i assume from the replies are the resistances should be the same for both Sensor 1 and Sensor 2, even though they are different part numbers??

Thanks for the references too!!

BigBallsMcFalls

if it is a different part number, then the front one is likely an air fuel sensor
not an o2 sensor,
and resistance test is not gonna fully diagnose jack.

.....
however, code 0420 -is- the rear sensor, or bad cats, so the
rear in fact is an O2 sensor and the resistance test applies

mkgarrison5

hahaha..... i am with big balls, no use in testing. get the correct code, look it up and replace the part.. sleep well