2000 safari failed smog test. p0155 02 sensor heater circuit

2000 safari failed smog test. p0155 02 sensor heater circuit

Postby dapperdan7 [OP] » November 15th 2011, 1:20am

how would any of you proceed with diagnosis? i have 10 days on a permit to correct the problem. it is sensor 2 bank 2.

Questions: is this sensor hard to reach?
might it be something besides the sensor (circuit?)

i figured i would ask first before blowing money at the mechanic.
any help much appreciated

dan
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Re: 2000 safari failed smog test. p0155 02 sensor heater cir

Postby RECox286 » November 15th 2011, 2:03am

You are probably looking at a failed heater in the O2 sensor. 12 y.o. van, ? miles. If it were mine, I would replace all the O2 sensors. They do tend to wear out with age

I don't think you would have much trouble doing the job yourself. Make sure the female threads are OK after taking the old sensors out. (You may want to chase the threads.)

Insure that there is a bit of antisieze compound on the male threads before winding the new sensors in. (Most sensors come with some stuff already on them.)

Bob
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Re: 2000 safari failed smog test. p0155 02 sensor heater cir

Postby dapperdan7 [OP] » November 15th 2011, 5:54pm

the sensors aint cheap so I'm going to have to get em one by one. 230,000 miles and she is a good runner. how much do faulty sensors affect the gas mileage? i imagine its a bit. thanx
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Re: 2000 safari failed smog test. p0155 02 sensor heater cir

Postby RECox286 » November 15th 2011, 6:25pm

O2 sensors are the big player when the system is closed loop. Bad O2= open loop, PCM dumps more gas into the equasion. 230k miles ? I'm surprised that they work at all. Usually need changing

in the 150k mi range for best driveability. Sensors are not all that expensive unless you want Bosh, or Made in USA. All three sensors can be had from RockAuto.com in the $100 and up range,

depending on the brand. You may find an MPG improvement. Or the truck may pass emissions. Who knows ?

Bob
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Re: 2000 safari failed smog test. p0155 02 sensor heater cir

Postby Corsemoto » November 17th 2011, 12:02am

Do yourself a favor and avoid sensor issues - Denso or Delphi, others can cause add'l codes imo. 02 sensor socket if you don't already have one.
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Re: 2000 safari failed smog test. p0155 02 sensor heater cir

Postby RECox286 » November 17th 2011, 2:22am

You can usually make out with a combination 7/8" wrench. Cut the connector off the old one to get it out with the box end, and then be careful putting the new

one in with the open end. I agree that the O2 wrench adapters and socket tools do make it easier, especially if you do this kind of work on a regular basis.

Bob
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Re: 2000 safari failed smog test. p0155 02 sensor heater cir

Postby dapperdan7 [OP] » November 17th 2011, 2:48am

thank you, gentlemen.
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Re: 2000 safari failed smog test. p0155 02 sensor heater cir

Postby dapperdan7 [OP] » November 17th 2011, 2:54am

a quick question: i have 3 o2 sensors on my van.are they all the same?

alao, the denso o2 sensors are under 40$ i assumed they would be $100 apiece. am i missing something?

thx
dan
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Re: 2000 safari failed smog test. p0155 02 sensor heater cir

Postby Leeann_93 » November 19th 2011, 9:44pm

They're all 3 the same and no, you're not missing something. $40 sounds right.
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Re: 2000 safari failed smog test. p0155 02 sensor heater cir

Postby RECox286 » November 19th 2011, 11:16pm

Look at the number of wires in the connector... 2 wires= no heater, 4 wires= heater. I have a combination of the 2 on my truck. $30 to $70 each is ballpark depending

on the brand. I prefer to use the Bosh sensors and have had no ill effects. Pick yer part, pay yer nickel.

Bob
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