Question about 1997 Chevrolet Astro

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I have sensor heating circuit malfunctiom on my 1997 astro van the code is po135 how can i find out how to fix this problem

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The heater circuit feeds the other 2 sensors and since there is no code for them we can reasonable assume that the wiring an fuse is good up to the splice.

Bank 1 sensor 1 is the sensor before the cat on the same side of the engine as the number 1 cylinder. If you check the vehicle side of the connector you should see a black, pink, purple and tan wire. Pink is the power to the heater, Black is the heater ground. Make sure there is 12 volts on the pink wire with the key on (possibly running) and make sure the ground is good.

If those 2 are good than I would have no problem changing the O2 sensor.

Posted on Sep 29, 2010

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My 98 villager have check engine light on with code PO135. I replaced bank 1 senor 1. after driving little bit same code came back again. then I replaced thermostat (the metar was always low, now it is ok)...


go to this website where there are files that will help you diagnose your issue.

http://autos.groups.yahoo.com/group/villagerquest/

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Sears did a computer eval on our car and gave us codes only


P0135--OXY SENSOR HEATER CIRCUIT(bank 1 sensor 1)
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P0155--HEATED OXY SENSOR HEATER CIRCUIT(bank 2 sensor 1)
P0161--HEATED OXY SENSOR HEATER CIRCUIT(bank 2 sensor 2)
P01132--LACK OF HO2S11 SWITCH--SENSOR INDICATES RICH
P01152--LACK OF HO2S21 SWITCH--SENSOR INDICATES RICH

Here are the code definitions.hope it helps.

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