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Go Back   REVscene Automotive Forum > Technical Discussion > Maintenance, Engine & Driveline Tech

Maintenance, Engine & Driveline Tech This forum is brought to you by The Speed Syndicate (TSS) in Burnaby.
Discussion of maintaining your engine, transmission, differentails, rear ends, and mods associated with "driveline" parts..

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Old 05-13-2012, 08:40 PM   #1
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Looking for Toyota Echo B1S2 help

Basically the CEL came on the other day. I checked the code and it was P0141 which points to the Bank 1 Sensor 2 Heated Oxygen Sensor. Reset the CEL so it was off just to make sure it wasn't a false alarm and it came back on within 1/2 hour of driving. So I unplugged it and checked the resistance of terminals HT and +B, which came up open. Thought I would see if the CEL would come back on with the sensor unplugged and it never did.

Can anyone tell me how the system works? What causes the CEL to come on if the circuit is open anyway with the sensor plugged in?

Or should I just replace the sensor and not bother trying to figure it out? I'd hate to waste my money buying something that isn't needed and the problem is somewhere else.
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Old 05-15-2012, 06:08 PM   #2
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The system uses 2-trip detection to check current in the O2, and will trip the CEL if current is greater than 2A or less than 0.2A. This is lifted straight from the Toyota FSM.

I would fancy trying to replace the O2 first. B1S2 is the sensor further away.
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Old 05-15-2012, 09:23 PM   #3
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Thanks for the reply CorneringArtist.

So the system uses the B1S2 sensor to check that the O2 sensor in front of the converter is doing it's job and if isn't, it will turn on the CEL? That would make sense to replace the first O2 sensor since it isn't working properly.

What do you think of the aftermarket sensors? Or would the OEM sensors be the better way to go?

Last edited by sleepywheel; 05-15-2012 at 09:24 PM. Reason: questions
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Old 05-15-2012, 09:38 PM   #4
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There are two separate codes for each O2 sensor, P0134 is for B1S1, while your code is specifically for B1S2.

Aftermarket sensor should be fine, but if you want the comfort in OEM parts, by all means go for it.
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Old 05-21-2012, 12:50 AM   #5
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Quote:
Originally Posted by sleepywheel View Post
Thanks for the reply CorneringArtist.

So the system uses the B1S2 sensor to check that the O2 sensor in front of the converter is doing it's job and if isn't, it will turn on the CEL? That would make sense to replace the first O2 sensor since it isn't working properly.

What do you think of the aftermarket sensors? Or would the OEM sensors be the better way to go?
usually the second o2 is used to make sure the cat is working
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Old 05-21-2012, 08:02 AM   #6
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Oem is the way to go but if you go aftermarket go with NTK brand. Stay far far away from Bosch o2 sensors.
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Old 05-21-2012, 04:34 PM   #7
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I've heard that the Bosch ones are problematic. I dropped by NAPA and was going to buy both sensors and be done with the problem until I found that they are around $125 each before taxes. It's not like I have money to throw around............. Doing more searching on the internet, I've found many other people have had the same code and ended up replacing the rear B1S2 sensor which did the job.
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