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Engine light came on. Checked the car with OBD II scanner
Engine light came on. Checked the car with OBD II scanner the code P0420 showed up. … read more
Ron Z.
Ron Z.
- Buick Tech -
Vocational, Technical or Trade Scho
22,068 satisfied customers
I had my main catalytic converter replaced. The one on the
Second opinion] I had my main catalytic converter replaced. The one on the manifold, but im still getting catalyst converter bank 1 error code. Why?… read more
Ron Z.
Ron Z.
- Buick Tech -
Vocational, Technical or Trade Scho
22,068 satisfied customers
Replaced catalytic converter and both O2 sensors. Now after
Replaced catalytic converter and both O2 sensors. Now after about a month I am getting the P0420 and a P0138 code. sensor 2 fluctuates … read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
20,157 satisfied customers
I'm still getting the p0420 error after going through a huge
I'm still getting the p0420 error after going through a huge puddle in my 2010 Lacrosse. The mechanic suggested replacing the O2 sensor to see if that would fix it rather than going for a new converte… read more
K. Wiggins
K. Wiggins
ASE Certified Technician
Associate Degree
3,977 satisfied customers
Check Engine Light for code P0420. Possible recall? Catalyic
Check Engine Light for code P0420. Possible recall? Catalyic Converter.... 8 yr/80 K .... possible O2 Sensor. Is there a recall on this problem with 2013 All Wheel Drive / Buick Encore? … read more
Ron Z.
Ron Z.
- Buick Tech -
Vocational, Technical or Trade Scho
22,068 satisfied customers
Showing p0420 p0446 p1441 codes. 02 buck regal ls. Nothing
Showing p0420 p0446 p1441 codes JA: Just to clarify, what's the exact code? And have you tried to reset it? Customer: Yes JA: What is the model/year of your Buick? Customer: 02 buck regal ls JA: Are y… read more
Tim Mohr
Tim Mohr
SHOP OWNER
Master's Degree
17,698 satisfied customers
Have a 2000 buick park avenue. Error code P0420. How to fix
have a 2000 buick park avenue. Error code P0420. How to fix it please. Check engine light is on. … read more
Ron Z.
Ron Z.
- Buick Tech -
Vocational, Technical or Trade Scho
22,068 satisfied customers
Failed emissions test. Jairo zone says code p0420 and onstar
Failed emissions test. Jairo zone says code p0420 and onstar diagnostic tells me p0420. I know oh and rh bank for catalytic system. Autozone say have to replace catalytic converters and jiffy lube sai… read more
Ron Z.
Ron Z.
- Buick Tech -
Vocational, Technical or Trade Scho
22,068 satisfied customers
I have a 2009 Buick enclave, chk engine light is on. P0420
I have a 2009 Buick enclave, chk engine light is on. P0420 code came back from a diagnostic. Replaced the fuel pump. Now having issues with the gas gage..I will fill the tank completely but the gauge … read more
Eric
Eric
Retired
N/A
38,694 satisfied customers
2003 buick lesabre lmt with 3.8 eng ckeck eng light comes on
2003 buick lesabre lmt with 3.8 eng ckeck eng light comes on ckeck codes showa cat code had it checked backpressure is good replaced computer plugs batty wires 1of the co2 sencers did not fix stalls a… read more
Gary
Gary
Buick Technician
Vocational, Technical or Trade Scho
1,545 satisfied customers
have a 2002 buick lesabre with about 65,000 miles on it - recently
have a 2002 buick lesabre with about 65,000 miles on it - recently I have had a problem with it bucking when I'm driving - really bad when I'm at a stop and when I try to give it some gas it goes it a… read more
Gary
Gary
Buick Technician
Vocational, Technical or Trade Scho
1,545 satisfied customers
Buick LeSabre: I own a 2001 Buick leSabre 3.8 eng. and got
I own a 2001 Buick leSabre 3.8 eng. and got a new universal cat installed 1 week later the check eng soon lite again this time both aft and fwd o2 sensors were replaced a few days later again the lite… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
24,674 satisfied customers
P0420, catalyst system below threshold(bank 1) is that the
P0420, catalyst system below threshold(bank 1) is that the sensor after the catalytic that picks that problem up?… read more
George H.
George H.
ASE Certified Technician
Associate Degree
541 satisfied customers
leak..exhaust..i replaced the converter and the downstream o2 sensor.
I recently had a p0420 code. i assumed it was caused by a leak between exhaust mainfold and the converer. i replaced the converter and the downstream o2 sensor. went to local parts store and erased al… read more
ZZDaryl
ZZDaryl
Lead Auto Tech
Some college and advanced training
11,485 satisfied customers
99 buick century: efficiency below..below threshold..very common cause
99 buick century. code 0420 cat efficiency below threshold. is the cat the most likely reason for this code, or is there a more likely reason, or a very common cause for this code other than the cat b… read more
George H.
George H.
ASE Certified Technician
Associate Degree
541 satisfied customers
98 buick lesabre: 3.8L..= error code reads possible cyl. 1 misfire
98 buick lesabre - 60,000 mi. - 3.8L - replaced intake gasket 7 mos. ago. Engine light is now on = error code reads "possible cyl. 1 misfire". Compression test: ok = repl. plugs, car skips mildly at 3… read more
Jerry
Jerry
Service consultant
Vocational, Technical or Trade Scho
13,108 satisfied customers
2002 Buick LeSabre: my check engine ligth..PO420..efficiency below
TI ype your question here.I have a 2002 Buick LeSabre and my check engine ligth on code PO420 Catalyst system efficiency below threshold(bank 1).What does this mean Thank you.… read more
Scott K
Scott K
Automotive Instructor
Vocational, Technical or Trade Scho
1,565 satisfied customers
Buick Century Custom 3.1L 2001 Check engine everytime, eat
Buick Century Custom 3.1L 2001 Check engine everytime, eat gasoline 65L for 400 km max, problem codes-P0135, after P0420. Changed two oxigen sensors, catalist, checked ingectors, fuel compression, air… read more
GM Tech (Cam)
GM Tech (Cam)
Owner/Technician
Vocational, Technical or Trade Scho
27,459 satisfied customers
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Meet the Experts:

Dave Nova

Dave Nova

Buick Technician

1,808 satisfied customers

ASE Master Certification. GM World Class Certification

Gary

Gary

Buick Technician

1,545 satisfied customers

15 years master GM tech and mater ASE tech

John

John

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ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.

Don - Mo Lurch

Don - Mo Lurch

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569 satisfied customers

GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

George H.

George H.

ASE Certified Technician

541 satisfied customers

ASE Master 15+years

Chris (aka- Moose)

Chris (aka- Moose)

Buick Technician

478 satisfied customers

16 years of experience

Mike S.

Mike S.

ASE Certified Technician

329 satisfied customers

A.S.E. certified

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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