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.
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Last edited by JFP in PA; 02-22-2019 at 08:38 AM.
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