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Thread: Unsupported O2 Sensor - IS it car or Scanner

  1. #1
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    Unsupported O2 Sensor - IS it car or Scanner

    Hi, I just bought an ELM 327 and connected it to my 2003 Toyota Camry LE.

    I needed to look at the O2 sensor reading, but I can only see the Bank 1 Sensor 2 reading. All the software I've downloaded (Scantool.net 1.1.3) and others say that Bank 1 Sensor 1 is not supported. I thought all cars that were OBD2 supported this? Is it something in my Camry? The Scanner Software? The ELM 327 chip?

    I doubt this car doesn't have an Upstream O2 sensor, as I believe it comes from California.


    Thanks

  2. #2
    Constant Bitrate joeyoravec's Avatar
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    I agree, it's a little hard to believe that there's no bank 1 sensor 1. You might want to try different software. I know PCMScan has a fast mode that trusts the cars "supported signals" list, and an aggressive mode that doubts the car and tests each signal individually. The aggressive mode takes longer, but sometimes it works better.

    It's not the chip -- if you can get one signal, you can get them all. Post the results if you try some other software. I'm curious to hear if it's the software or just the car.

  3. #3
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    Ok. I tried, but, without paying for the software, I can't test it.

    I connected the scanner to the Car again and the return data for PID 13 indicates only B1S2 is supported. On another note, I read somewhere that some Toyotas use an Air Fuel Sensor and not a O2. I thought they were the same, but I'm probably mistaken. If that were the case, does anyone know if a Toyota Camry has extended PID codes, and what they are?

    On a side note, the readings for the S1B2 indicates a voltage of .72 most of the time. Sometimes it cycles, but not always. Shouldn't the sensor after the CAT be closer to .45?

  4. #4
    Constant Bitrate joeyoravec's Avatar
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    I've heard people use the word air/fuel sensor also. Maybe some of the imports use that word in their shop manuals? Another wild guess -- maybe your car uses a wideband sensor in that position, so check pids $24 and $34. You were using $13 to $1B which is only for conventional narrow range sensors.

  5. #5
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    Though I haven't checked, I believe your guess is not so Wild. I've been looking on the web and it looks like that Air/Fuel Sensor is a Wide Band Sensor. I found a web site that talked about Toyota Solara and it indicated the A/F voltage is from 0 to 4 and can be read through the same PIDs you mentioned.

    That makes me believe PCMScan will read it because that PID is in the list of items it can record.

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