Question about 2003 Pontiac Montana

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How long does it take for the computer to relearn everything after I replace the upstream o2 sensor?

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Drive it normally on highway and locally and idle for a few days and it should have learned by then.

Posted on Jul 13, 2010

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Where is the O2sensor bank 1 at with a code of P0420. AND do I need to replace both sensors upstream and down. Or just the one that is showing up on the obd scanner.


Bank one is front side of cat. It should also tell u if it's cat 1 or cat 2. Depending on make an modle an yr. Catalyst 1 bank 2 is left cat back sensor. Catalyst 2 bank 2 is right cat back sensor. U do not have to replace upstream also. My o2 sensor Catalyst 2 bank 2 went bad. Had engine code for burning rich bank 2. Replaced tha down stream sensor an fixed problem runs better an better gas. This was in 97 gmc suburban. Idk what vehicle ur askin about. An I'm not to familiar with much about cars jus trucks an suvs.

Jan 02, 2017 | Cars & Trucks

1 Answer

Oxygen sensors on 2002 Honda CR-V


P1166 pertains to the upstream O2 sensor heater circuit. P1167 pertains to the upstream O2 sensor output.

Sep 24, 2008 | 2002 Honda CR-V

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Can an O2 oxygen sensor effect another sensor and give a false reading?


Check which side of your engine has cylinder #1. That side is bank 1. Bank 2 is the side opposite of bank 1. So bank 2 is not always passenger side. And since you seem to have extra O2 sensors, I would replace the other upstream and see what happens. Also the mass air sensor can give a trouble code issue to the upstream 02 sensors. Good luck. I've struggled thru this myself.

Mar 06, 2015 | Cars & Trucks

1 Answer

Good afternoon..... I've been on here before My question is this.....I have a 2006 nissan altima 2.5s and the check engine light us on .....I replaced the O2 sensor by the cat. And u cleared the code and...


bank 1 sensor 2 is not the upper sensor, it is behind the cat converter, replace it, disconnect the battery and go drive it to somewhere to have the codes cleared. It will relearn the fuel table to run properly

Aug 10, 2014 | Cars & Trucks

2 Answers

2000 navigator system too lean


Too Lean on which Bank of the Motor?

To have a lean O2 Code --you could have a rich fuel
condition & the pcm drove the fuel trim lean

Next you could have a vacuum leak-in the intake or exhaust system

Third you could have a failed O2 Sensor

Front or Upstream Oxygen Sensors get replaced at 100,000 miles

The front sensors are on the exhaust pipe between the motor &
the converter.

Will need a long handled flex head O2 Sensor Wrench

Mar 17, 2014 | 2000 Lincoln LS

1 Answer

I have replaced the o2 sensor the upstream one


i find most o2 problems aren't o2 problems they are fuel delivery problems like partly plugged fuel filters or temp sensors or dirty air filters the worst ones are bad catalytic converters that is always last resort

Mar 12, 2010 | 1997 Mitsubishi Mirage

2 Answers

P0136, P1131, and P1151 codes on Ford Expedition 2000 4.6L


Your auto has four O2 sensors. Two upstream and two downstream; With two banks. Bank 1, sensor 1...and bank 2, sensor 1 are the two upstream (exhaust manifold before the catalytic). Bank 1, sensor 2 and bank 2, sensor 2 (other side of catalytic)

Code 1131= upstream; bank 1..sensor 1
Code 1151= upstream; bank 2..sensor 1
Code P0136 (generic code) bank 1..sensor 2 (questionable)

I wouldn't spend the money to purchase 3 sensors. Highly unlikely all three are bad; Cost is about $40/ ea.
Since there isn't a code for the cat's themselves, I would suspect the O2 circuit is malfunctioning. The rough idle is another clue.


Take an ohmmeter set it on X10 scale and measure the resistance from engine to body and body to negative post on battery terminal. You should read zero ohms (full needle deflection). If you do go buy two upstream O2 sensors. If you read
open or a high resistance run two straps from eng. to body...and body to neg.batt. post.

FixYaWIZ................saailer

Dec 10, 2009 | 2000 Ford Expedition

1 Answer

2000 sk8 with trouble code 1647


The DTC code P1647 indicates that there is a issue with the O2 sensor bank 2 upstream. What caused the code could be a heater failure to the O2, Sensing circuit failure (Short circuit to ground, short circuit to hight voltage, or open circuit). Last would be ECM failure but that's rare. The Bank 2 is the radiator side, check the wire harness to the O2, The harness to both upstream and downstream O2 sensor are connected to a bracket in front and below the battery. Look for corrosion and follow the harness for any breaks that would cause a short in the system. Also check the fuse to the O2 sensor heaters, not sure which fuse it is but check all the fuses in the fuse box under the hood. If everything is ok then most likely the O2 sensor needs to be replaced. Good luck and hope this helps.

Jun 12, 2009 | 1999 Jaguar XK8

1 Answer

Replace oxygen sensors


these engines have 1 upstream o2 sensor and 1 downstream o2 sensor..the 1 in the rear exhaust manifold is the upstream and the 1 after the converter is the downstream..make sure you replaced the right one

May 15, 2009 | 1998 Plymouth Grand Voyager

2 Answers

Check engine light


Sometimes can be prematurely dirty air filter, sets off the air flow sensor, which sets off the o2 sensor. So might try new air filter first and erase codes and then see, before you spend more bucks than you need; then if codes return, do the flow mix sensor.

Apr 19, 2009 | 2006 Honda Civic Hybrid

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