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hi-tek22 · 12-26-2008, 04:23 PM

start in this thread......its actually stickied

SES/Check Engine Codes, O2 Sensor Locations and Codes, and TSB's inside....

P0139 - Heated Oxygen Sensor 2 Circuit Slow Response (Bank 1)

its the precat, the one before the main cat....you have a 2000, so its the one in the actual Y pipe...and that is actually the rear precat

the front precat = THE precat directly in front of the radiator and inside the engine bay

the rear precat = THE precat directly below the firewall, typically what you would replace if you got a y pipe

my suggestion is to just replace the o2 sensors, CHECK OUT www.sparkplugs.com, and https://www.automedicsupply.com/inde...80&height=1050

12-26-2008, 04:23 PM	#2
hi-tek22 Senior Member 2001 Nissan Maxima Join Date: Oct 2007 Location: Baltimore, MD iTrader: (4) Posts: 933	start in this thread......its actually stickied SES/Check Engine Codes, O2 Sensor Locations and Codes, and TSB's inside.... P0139 - Heated Oxygen Sensor 2 Circuit Slow Response (Bank 1) its the precat, the one before the main cat....you have a 2000, so its the one in the actual Y pipe...and that is actually the rear precat the front precat = THE precat directly in front of the radiator and inside the engine bay the rear precat = THE precat directly below the firewall, typically what you would replace if you got a y pipe my suggestion is to just replace the o2 sensors, CHECK OUT www.sparkplugs.com, and https://www.automedicsupply.com/inde...80&height=1050 __________________ Megan Racing exhaust \| Tokico Illumina's 4F/5R \| H&R Springs \| ebay FSTB \| \| ES Bushings \| Goodridge SS Lines \| Berk Air Intake \| Cleared 2K2 Headlights \| 8k D2R & 50W H3 Fogs upgrade \| Cleared Sidemarkers \| White LED's all around (Interior & Exterior) \| Chrome Gauge Rings \| 15% Tint (all around) \| RTP Zinc plated Slotted Rotors \| Hawk HPS pads \| RPM R-505 19x8.5 wrapped in General Exclaim UHP 245-35-R19 \| Optima Yellow Top \| Hella Supertones \| (2) 12" Alpine Type R's Last edited by hi-tek22; 12-26-2008 at 04:27 PM.