1999 LEXUS ES300 CODES P0125, 1153, NEW SENSOR FOR THE 1153 JUST INSTALLED LAST WEEK NOW LIGHT BACK ON?

  • Tiny
  • brdsmith15
  • 1999 Lexus ES
  • 160,000 miles

1999 Lexus es300 codes p0125, 1153, New sensor for the 1153 just installed last week light back on now, same codes previously?

Thursday, May 31st, 2012 AT 6:24 AM

6 Answers

  • Tiny
  • rasmataz
  • Member

Both sensors P0125-coolant temperature and P1153 Manufacturer Controlled Fuel and Air Metering. Are they OEM parts?

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Thursday, May 31st, 2012 AT 6:41 AM
  • Tiny
  • brdsmith15
  • Member

Yes installed by Lexus under warranty from a previous replacement only the a/f sensor as the coolant temp sensor is an accompanying code but it was changed also maybe 2 years ago.

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Thursday, May 31st, 2012 AT 6:55 AM
  • Tiny
  • rasmataz
  • Member

Have it further checked out if its need be have it replaced

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Thursday, May 31st, 2012 AT 7:01 AM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

Diagnostic Aids

After confirming DTCs P1153, use scan tool to access CURRENT DATA to confirm voltage output of heated oxygen sensors (bank No. 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. OBD-II scan tools will display one fifth A/F sensor output voltage as Lexus scan tool will. 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 maybe less than 0.56 volts (2.8 volts on Lexus scan tool). During fuel cut, output voltage of A/F sensors maybe more than 0.76 volt (3.8 volts on Lexus scan tool). If output voltage of A/F sensor remains at 0.66 volt (3.3 volts on Lexus scan tool) 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 Lexus scan tool) 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 Lexus scan tool) or less during all conditions, A/F sensor circuit may be shorted.

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Thursday, May 31st, 2012 AT 4:42 PM
  • Tiny
  • brdsmith15
  • Member

Has been back to dealership and another a/f sensor installed as the one from last week has already went bad? ECM Issue? Or do I need to look to the CTS?

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Wednesday, June 6th, 2012 AT 9:35 AM
  • Tiny
  • KHLow2008
  • Expert
  • 41,976 posts

I believe it is the sensor itself. Some new sensors are bad as well and worst part is that one whole batch of stock could all be faulty if they are from the same source.

Anyway get the datastream to understand if the A/F sensor or any other components are working within specification.

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Wednesday, June 6th, 2012 AT 2:18 PM

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