Hello, I have 2000 Toyota Sienna, LE.

Tiny
BAJRANGBALI1
  • MEMBER
  • 2000 TOYOTA SIENNA
  • 130,000 MILES
Hello,
I have 2000 Toyota Sienna, LE with 3.0L 1MZ-FE engine. Lately, I get intermittent DTC P1130 & P1150. I understood these DTC are for Air Fuel Ration Bank1 Sensor1 (B1S1) and Bank2 Sensor1 (B2S1). I measured resistance on B1S1 at room temperature and it is 1.2ohm which I understand is within the rage. Since B2S1 is near firewall, I am not able to measure the resistance. These sensors are never replaced.

The van runs fine not problem. My questis are:
(1) Is it possible that the bit sensors are not completely bad but they are on their way out hence the DTCs are intermitatnt. I get MIL then it goes away. Then it comes back after few days.
(2) Is it possible for botn sensor to go bad at the same time.

Please advise.
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Monday, March 25th, 2013 AT 3:42 PM

3 Replies

Tiny
KHLOW2008
  • EXPERT
Yes, sensors can fail simultaneously.

Diagnostic Aids

After confirming DTC P1130 and/or P1150, use scan tool to access CURRENT DATA to confirm voltage output of heated oxygen sensors (bank No. 1 and 2 sensor No. 1). ECM controls voltage of AF+ and AF- terminals at ECM to a fixed voltage (3.3 volts at AF+ terminal; 3.0 volts at AF- terminal). It is impossible to confirm A/F sensor output voltage without using a scan tool. A/F sensor output voltage on OBD II scan tools is displayed at one fifth the voltage of that displayed on Toyota hand-held tester. Using scan tool, read freeze frame data. Freeze frame records engine conditions when malfunction is detected.
During fuel enrichment, output voltage of A/F sensors may be less than 0.56 volt (2.8 volts on Toyota hand-held tester). During fuel cut, output voltage of A/F sensors may be greater than 0.76 volt (3.8 volts on Toyota hand-held tester). If output voltage of A/F sensor remains at 0.66 volt (3.3 volts on Toyota hand-held tester) during all conditions, A/F sensor circuit may be open. If output voltage of A/F sensor remains at 0.76 volt (3.8 volts on Toyota hand-held tester) or more during all conditions, A/F sensor circuit may be shorted. If output voltage of A/F sensor remains at 0.56 volt (2.8 volts on Toyota hand-held tester) or less during all conditions, A/F sensor circuit may be shorted.
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Monday, March 25th, 2013 AT 8:01 PM
Tiny
BAJRANGBALI1
  • MEMBER
Thank you very much KHLow2008 for your prompt answer.
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Tuesday, March 26th, 2013 AT 12:28 AM
Tiny
KHLOW2008
  • EXPERT
You're welcome.
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Tuesday, March 26th, 2013 AT 2:22 PM

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