02-22-2019, 04:57 AM
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#1
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Registered User
Join Date: Dec 2018
Location: Lowell NC
Posts: 45
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CEL. O2 sensor
CEL code before and same code after all O2 sensors installed(bank 1 sensor 1) any suggestions? Have reset code twice with obd2 device. Car runs excellent, lotsa power, excellent mileage,etc.
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02-22-2019, 05:00 AM
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#2
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Registered User
Join Date: Dec 2018
Location: Lowell NC
Posts: 45
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1999 Boxster, five spd, 82k , recent IMS upgrade
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02-22-2019, 05:34 AM
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#3
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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Quote:
Originally Posted by Tmar04
CEL code before and same code after all O2 sensors installed(bank 1 sensor 1) any suggestions? Have reset code twice with obd2 device. Car runs excellent, lotsa power, excellent mileage,etc.
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What codes?
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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02-22-2019, 07:24 AM
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#4
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Registered User
Join Date: Dec 2018
Location: Lowell NC
Posts: 45
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PO 134 code, before and after new o2 sensors installed
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02-22-2019, 08:35 AM
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#5
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
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Quote:
Originally Posted by Tmar04
PO 134 code, before and after new o2 sensors installed
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This is a great example of why you shouldn't replace anything before you know what the codes are telling you. P0134 is the code for the interruption of the signal from the O2 sensor ahead of the three way cat on bank #1. Usually, this is caused by a problem with either the signal or ground wire connected to the sensor, and is rarely caused by the sensor itself. The diagnostic tree in the factory OBD II manual for the car involves checking the wiring by using a multimeter to test the ohms between pins #1 and 2 (should read 1.8-2.5 ohms at 20 degrees C), and test the ground continuity between each of these pins and the sensor housing itself (each should read infinite ohms). The harness connector pins 3 and 4 should read ~450 mV, and pin 3 to ground should read ~750 mV. Harness connector pins 1 and 2 should show battery voltage. If any of these tests are out of bounds, you have a wiring fault, not a sensor fault.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
Last edited by JFP in PA; 02-22-2019 at 08:38 AM.
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02-22-2019, 03:15 PM
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#6
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Registered User
Join Date: Dec 2018
Location: Lowell NC
Posts: 45
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Thank you so much for the education. And thank you for not being a ‘wise guy’. Your expertise is to be admired ( and much sought after)
Have a good one.
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02-22-2019, 04:39 PM
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#7
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Registered User
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,848
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Quote:
Originally Posted by Tmar04
Thank you so much for the education. And thank you for not being a ‘wise guy’. Your expertise is to be admired ( and much sought after)
Have a good one.
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+ 1 on JFP
He has helped many people here including myself, and I had always appreciated his kind support!
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02-23-2019, 06:38 AM
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#8
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Registered User
Join Date: Jul 2017
Location: Tucson AZ
Posts: 536
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Quote:
Originally Posted by Gilles
+ 1 on JFP
He has helped many people here including myself, and I had always appreciated his kind support!
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JFP and MikeFocke are great resources and never abuse questioners. Class of the forums!
__________________
2001 Boxster
2007 Toyota Highlander
2003 New Beetle Convertible, Turbo, Tip 6 speed 
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02-23-2019, 11:09 AM
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#9
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Registered User
Join Date: Aug 2005
Location: Sanford NC
Posts: 2,537
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The codes the O2 sensors throw are some of the most specific.
So another question after checking the wiring is what O2 sensors did you replace them with?
Keep the old "bad" ones as spares as they may be good.
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