Lexus

Lexus troubleshooting questions? Ask a Lexus Expert

Ask an Expert,
Get an Answer ASAP!

2001 gs 300 with P430 and P440 codes. P430 and P440 and I…

Customer Question
2001 gs 300 with...

2001 gs 300 with P430 and P440 codes

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

P430 and P440 and I have reset twice

Mechanic's Assistant: Are you fixing your GS 300 yourself? What have you tried so far?

Wiat one

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Induction cleaning system service, engine restoration service and oil change

Submitted: 10 months ago.Category: Lexus
Show More
Show Less
Ask Your Own Lexus Question
Answered in 2 minutes by:
9/25/2017
Lexus Mechanic: Ron, ASE Certified Technician replied 10 months ago
Ron
Ron, ASE Certified Technician
Category: Lexus
Satisfied Customers: 38,841
Experience: 35 years working as an ASE certified tech.
Verified

Hello. My name is ***** ***** I am happy to assist you today. Give me just a moment to review your post, and I'll be right back with the help you need.

Ask Your Own Lexus Question
Lexus Mechanic: Ron, ASE Certified Technician replied 10 months ago

The common cause for the code P0430 to set in most cases is caused by a failing Bank 2 Catalytic Converter and in most cases replacing the converter will solve this code.

The code P0440 is an EVAP system leak detected code and the common cause for this one to set is a loose and or leaking gas cap. If your sure the cap is tight and not leaking then to determine where the leak is you are going to need to have a smoke test performed on your EVAP system. Start first with checking the gas cap and let me know what you find and we can work from there if need be.

Ask Your Own Lexus Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a lexus mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Ron Your Own Question
Ron
Ron
Ron, ASE Certified Technician
Category: Lexus
Satisfied Customers: 38,841
38,841 Satisfied Customers
Experience: 35 years working as an ASE certified tech.

Ron is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

THANK YOU, THANK YOU, THANK YOU!! I've got my baby back. Tomorrow I will get a tank of high octane, remove the top, go for a long long ride and enjoy my car. THANK YOU!

JugheadUSA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

lexpert

lexpert

Lexus Master tech

2,100 satisfied customers

Master Certified with lexus, 8 years experience with Lexus

Skyvisions

Skyvisions

ASE Certified Technician

1,848 satisfied customers

Lexus Expert

Ron Z.

Ron Z.

- Lexus Tech -

454 satisfied customers

18+yrs experience. State Inspector and Lexus Diagnostics

Chris (aka - Moose)

Chris (aka - Moose)

Technician

345 satisfied customers

16 years of experience

AMD

AMD

Master Technician

270 satisfied customers

L1 Advanced Level Diagnostics Specialist

George H.

George H.

ASE Certified Technician

224 satisfied customers

15+ years ASE Master w/L1 Drivability certification

Tim Mohr

Tim Mohr

ASE MASTER

129 satisfied customers

30 YEARS EXPERIENCE, FORIEGN AND DOMESTIC, GAS AND DIESEL

< Previous | Next >

Related Lexus Questions
I HAVE A 07 GS350 AND THE CHECK VSC AND ENGINE LIGHTS ARE
I HAVE A 07 GS350 AND THE CHECK VSC AND ENGINE LIGHTS ARE ON. I HAD THE CAR SCANNED AND THE CODE P430 SHOWED THAT ONE OF THE CATALYIC CONVERTERS WAS BAD. THE CAR HAS 107,000 MI AND I DON'T THINK IT SH… read more
Gunvir Singh
Gunvir Singh
1,949 satisfied customers
We have a 2006 Lexus GS 300 - they used the Japanese engine
Second opinion] we have a 2006 Lexus GS 300 - they used the Japanese engine that one yr only and our check engine lights keep coming on - we have changed the oxygen sensors but to no avail - we take i… read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
I have a 2006 Lexus GS 300 AWD and I got a P2757 code with
I have a 2006 Lexus GS 300 AWD and I got a P2757 code with shifting problem. I would like to know what is the part number that I should change … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
I replace water pump timing belt is installed correctly like
I replace water pump timing belt is installed correctly like all data...Shows in the diagram ..It fire ones only while ur cranking over the engine … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Lexus gs 300: I have a 2001 lexus gs 300 with check engine
I have a 2001 lexus gs 300 with check engine light, have tried many things to fix this but cannot seem to get it right. Lates has been a new after market gas cap but light came back on after 2 days of… read more
Ron Z.
Ron Z.
- Lexus Tech -
Vocational, Technical or Trade Scho
454 satisfied customers
Lexus Gs 300: I have a 2006 Lexus gs 300 and the vsc light
I have a 2006 Lexus gs 300 and the vsc light appears on the dash whin I am driving . I have changed the transmission oil and cleaned the gauze but the vsc light remains on. What would you recommend. K… read more
Ross
Ross
Automotive Technician/Conaultant
Vocational, Technical or Trade Scho
470 satisfied customers
Lexus 400h: I bought a used 2007 Lexus 400h 1 year ago. When
I bought a used 2007 Lexus 400h 1 year ago. When I got it I was getting about 25mpgs in the city. Now I am getting 15. I have read that changing the battery can affect the hybrid system. I replaced my… read more
Technician Chris
Technician Chris
Vocational, Technical or Trade School
366 satisfied customers
lexus gs300: working on a 2001 gs 300. The vehicle idles perfect,
working on a 2001 gs 300. The vehicle idles perfect, but bogs upon acceleration.Tried mass air flow sensor, throttle body, correct fuel pressure, exhaust has no restricton. It also throws codes 171 & … read more
LexusPro
LexusPro
Master Lexus Technician
1,031 satisfied customers
Lexus ES300: My 2000 ES 350 had its 115,000 service 2 weeks
My 2000 ES 350 had its 115,000 service 2 weeks ago at the lexus dealership. I have owned the car since 8500 miles and serviced it at the dealership. It does not burn oil. This past weekend the check e… read more
HondaPlatinum
HondaPlatinum
High School or GED
148 satisfied customers
Lexus Ls...gs...or es: Hey...Looking into a Lexus ls(NNN) NNN-NNNN.
Hey...Looking into a Lexus ls(NNN) NNN-NNNN. Or...es(NNN) NNN-NNNN.. Or lexus gs(NNN) NNN-NNNN Out of the 3 cars...which one would be the sane and affordable purchase? No salvage title on any of these… read more
Anthony
Anthony
Master Automobile Technician
Vocational, Technical or Trade Scho
8,789 satisfied customers
Lexus GS300: I own a lexus GS 2001. I bought it used 6 years
I own a lexus GS(NNN) NNN-NNNN I bought it used 6 years ago and was only given a Master Key and a Concierge key. I have lost the master key and was wandering what my options are. Does Lexus give a one… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
1,848 satisfied customers
2000 Lexus RX300: AWD..much gas..Is it because I am using 93 gas?
I bought a 2000 Lexus RX300 AWD with 169K. Not sure why, but I think it's taking too much gas. Is it because I am using 93 gas? Is there something that might need replacing to make it more gas-effecti… read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
300 gs: car wont start. after jumping it, and taking off cables..die
I have a 99 lexus 300 gs. car wont start. after jumping it, and taking off cables. it will die. The longer the cables are on charging the battery, the longer it stays on after taking off the cables.. … read more
Paul M ASE Master
Paul M ASE Master
Automotive College
3,307 satisfied customers
2000 GS: EVAP..o2 sensor..inspection..check engine
I have a 2000 GS 300, trouble codes indicate Bank 2 S 2, EVAP Emmission system, Idle air control system, VVT system malfunction. Can i get away with just changing out o2 sensor to pass an emmission in… read more
HondaPlatinum
HondaPlatinum
High School or GED
148 satisfied customers
2000 lexus: converters..headers...replaced..four o2 sensors.trouble
2000 lexus gs 300 in wilmington,nc,had code p430,replaced cat converters that are built into the headers. ordered from lexus dealer in california.replaced all four o2 sensors. trouble cleared for 6 mo… read more
Skyvisions
Skyvisions
ASE Certified Technician
High School or GED
1,848 satisfied customers
Lexus: car makes rattling noise and vibrates under 500 rpm..gs
car makes rattling noise and vibrates under 500 rpm, while in drive gear with break pushed in. what's the problem? it's a 04 lexus gs 300 with only 57000 miles. thanks… read more
CJ
CJ
Bachelor's Degree
106 satisfied customers
navigation: 2001 lx 470 whos radios audio doesnt work..drivers side
Hi I have a 2001 lx 470 whos radio's audio doesnt work.I can see what station it is on but I sont get any sound. Im perplexed because the audio on the drivers side for the navigation is working. How c… read more
Richard M
Richard M
Toyota Technician
High School or GED
58 satisfied customers
1999 Lexus: oil change..air filter..the check engine light came on. I
I have an 1999 Lexus GS 300. Yesterday i got gas, oil change and air filter change and the check engine light came on. I took is to have it tested at auto zone and they tested it and it was a sensor o… read more
JEFFREY
JEFFREY
High School or GED
22 satisfied customers
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.

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.

Show MoreShow Less

Ask Your Question

x