Question about 2004 Buick LeSabre

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Oxygen sensor Would a bad 02 sensor cause the car to quit unexpectedly while driving? Catalytic conv? Car quit whilr going 65 on highway. Now starts but kills. Not the fuel injector for sure...thoughts?

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Yes, O2 sensor may sometimes lead to engine stalling. But also make sure that the MAF sensor is working properly. Better check for codes if the CEL is blinking.

Posted on Apr 25, 2013


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Posted on Jan 02, 2017

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my 97 lesabre did the same thing. i found the positive cable connection at the battery was loose.i tightened it, problem appears to be solved.

Posted on Sep 14, 2008

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SOURCE: 89 Buick centry 6 cylinder 3300,at highway speed

plugs plug wirres or coils?

Posted on Jul 12, 2009

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SOURCE: I have to give gas to start if not the car stalls

need to have a fuel pressure test also make sure egr is not open at idle car wont run with egr open at idle

Posted on Oct 20, 2009

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SOURCE: My 1988 Buick Lesabre Limited just began to have a

Get the codes checked. A bad mass air flow meter will do this. Also replace the fuel filter. Check for vacumn leaks too.

Posted on Dec 04, 2009

Testimonial: "Vacuum leak it was thanks to the plastic elbow on the PCV valve. It must have gotten brittle and was missing a good chunk. Cost under $4. Thanks."

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SOURCE: Buick LeSabre makes funny sound!!!

It is a sign of a clogged convertor, but i happen to own the same car (with a series 2 3800) and had the same symtpoms going on when i bought if for the wife. Mine turned out to be a Exhaust Gas Recirculation Valve (EGR Valve).

To kind of get a feel for what is going on with the convertor, you can have someone help you but sitting in the drivers seat, with the car running. You go behind the car near the tail pipe. Now have the other person rev it up a little, not to much though. Put your hand but the tail pipe to see what kind of pressure the exhaust has. You can use another vehical to do the same thing to feel what things are supposed to feel like. If the convertor is plugged, the pressure of exhaust coming out will be a lot softer than it should be.

If after checking it as discribed above, if you feel it is plugged, grab a hammer, and bang the heck out of it. This will break up and loosen the clogged part without have to replace it.

There is no really good way to test a EGR vavle without a special computer. Replacing it however, does seem to me as the most likely repair for this vehical. It is located on the top of the drivers side of the motor. It look like a cylinder with a wire coming out of the cap, and is held on by 2 13mm nuts.

Good Luck....

Posted on Mar 24, 2010

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EOBD II Error Code: P0420
Catalytic Converter System, Bank 1 - Efficiency Below Threshold
Possible Causes:
- Leakage in Intake and/or Exhaust System.
- Catalyst faulty.
- Oxygen Sensor(s) faulty.
- Oxygen Sensor(s) Control faulty.

- Check Intake and Exhaust System for Leaks.
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- Check Oxygen Sensor(s).
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02 sensors are not major repairs. Trouble is it might also be a catalytic converter . Replace the 02 sensor that the code indicates and have the code erased by AutoZone.
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17584/P1176/004470 - Bank1: O2 (Lambda) Correction Behind Catalyst: Control Limit Reached Possible Causes
  • Intake Air System leaking
  • Oxygen Sensor(s) and/or Oxygen Sensor Control faulty
Possible Solutions
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This is the pre 02 sensor located before the catalytic converter.

May 10, 2010 | 2000 Volkswagen Jetta TDI

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What do my car need if they say i have a (bad)up scream senors----my car will cut of while driving, i have to wait for a while then it will start back up, check engine light is on.

upstream sensors are oxygen sensors there are up streams and down streams. there might be a problem with converter too. must read all codes then of them (oxygen and converter) could cause cause codes on each other

Feb 12, 2010 | 2002 Jaguar X-Type

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Were on exaust is oxygen sensor in 1999 subaru impreza auto sport

On the SOHC engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the front catalytic converter. On the DOHC engine the front oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the catalytic converter.

Oxygen sensor location-Baja 2.5L SOHC engine

Oxygen sensor location-Baja 2.5L DOHC engine

On the 2.0L engine the front (A/F) oxygen sensor is located in the front section of the exhaust system, just past the crossover pipe. The rear oxygen sensor is located in the front section of the rear catalytic converter. On the 2.2L engine the front (A/F) oxygen sensor is located in the front section of the front catalytic converter. The rear oxygen sensor is located in the rear section of the rear catalytic converter.

Oxygen sensor location-Impreza 1998-2001 2.2L engine

moz-screenshot.pngOxygen sensor location-Impreza 1998-2002 2.5L SOHC engine
I hope helped with this; remember rated this help. Good luck.

Nov 20, 2009 | 1999 Subaru Impreza

2 Answers

I replaced all of the O2 sensor on my car, but the check engine light is still on, or came back on with hte same code

check your heated 02 fuses. check your wiring for rubbed through insulation. also, lots of PCM issues and reflashes on these cars.

Nov 11, 2009 | 2004 Chrysler Sebring

2 Answers

01 toyota tundra stalls at idle....engine code p0420

Could be a problem with the Catalytic Converter or oxygen sensor (H02S bank 2 )

Sep 09, 2009 | 2001 Toyota Tundra

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$250 oxygen sensor parts only 2002 Jeep GC too much? needed?


Aug 23, 2009 | 2002 Jeep Grand Cherokee

1 Answer

MIL light on

P0139 Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Slow Response This is the Catalytic Converter efficiency monitor, it is reporting that the Cat Conv is not working as it should (cleaning up the exhaust), how many miles on the car?

Dec 22, 2008 | 2003 Acura RSX

1 Answer

Service engine light on

P0430 Catalyst System Efficiency Below Threshold
P1684 simply means the battery was disconnected within the last 50 key starts.
The P0430 is the important code to deal with. Either the catalyst is stopped up or the Oxygen sensor(s) are not working. This problem will effect the driveability of your car very badly. The easy and cheaper thing to replace is your Oxygen sensor (s) (some cars have more than one Oxygen sensor, replace both if that is the case). If that isn't the problem take the car to the dealership because this could be called an emissions problem and most manufacturers have a 100,000 mile warranty on the emissions system, you might be able to get the catalytic converter replaced for free.

Good luck

Nov 13, 2008 | 2001 Dodge Neon

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