Lexus

Lexus Troubleshooting Questions? Ask a Lexus Expert

Ask an Expert,
Get an Answer ASAP!

Lexus

I've got a 2000 lexus gs300 with the check engine light on.

Customer Question
Codes are p0300, p0301, p0303...
I've got a 2000 lexus gs300 with the check engine light on. Codes are p0300, p0301, p0303, p0305. I have replaced spark plugs, coils, wires, mass air flow, tps. It only happens when warm and under acceleration.
JA: Does the light stay on, or does it blink?
Customer: It blinks then stays on. It picks up misfire in #5 first then the others
JA: What is the make/model of your car?
Customer: 2000 GS300
JA: Are you fixing your GS300 yourself? What have you tried so far?
Customer: Yes, I have replaced the spark plugs (DENSO), wires (denso), Coils, (denso) mass air flow and tps
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 1 year ago.Category: Lexus
Show More
Show Less
Ask Your Own Lexus Question
Answered in 5 minutes by:
11/8/2016
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago
David Craig
David Craig, Auto Mechanic
Category: Lexus
Satisfied Customers: 4,017
Experience: Owner/Mechanic at 3D Automotive
Verified

Hi Im David, thanks for visiting the site. those are all you back bank cylinders....interesting. I got to recommend a backpressure test on the exhaust to see if that cat is clogged. and also a compression test on that rear head.

Ask Your Own Lexus Question
Customer reply replied 1 year ago
It's a straight 6
Customer reply replied 1 year ago
The coils are on #2,4,6 cylinders and wires are on #1, 3, 5
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

oh crap thinking of toyota 3.0

Ask Your Own Lexus Question
Customer reply replied 1 year ago
Any ideas?
Customer reply replied 1 year ago
Two exhaust manifolds- 1-2-3 on one and 4-5-6 on other
Customer reply replied 1 year ago
No, that's a V6, Mine is a 3.0l straight 6
Lexus Mechanic: David Craig, Auto Mechanic replied 1 year ago

ok, im not familiar with that engine. ill opt out and allow another tech to chime in.

Ask Your Own Lexus Question
Customer reply replied 1 year ago
The engine is a 2JZGE
Lexus Mechanic: mike switzer,
 replied 1 year ago
mike switzer
Category: Lexus
Satisfied Customers: 717
Experience: lead diagnostic tech at Aamco
Verified

do the misfires happen all the time or only when warm?

Ask Your Own Lexus Question
Customer reply replied 1 year ago
Mainly when warm and under medium/ heavy acceleration
Customer reply replied 1 year ago
Also, I have done a compression test on all cylinders and they are good. I have removed the connector for the ECM and noticed a little fluid (like dielectric grease). Cleaned connector with electrical contact spray. Just puzzles me why it's only on odd cylinders.
Lexus Mechanic: mike switzer,
 replied 1 year ago

it is how the system works since it only has 3 coils and three wires. when was the last time the wires and boots were done.

Ask Your Own Lexus Question
Customer reply replied 1 year ago
The wires have been replaced twice , thinking I had a bad set. Cool we're replaced within the last 3 months.
Lexus Mechanic: mike switzer,
 replied 1 year ago

what brand do you have also what brand coils what about the plugs?

Ask Your Own Lexus Question
Lexus Mechanic: mike switzer,
 replied 1 year ago

and silly question but are you sure the wires are routed properly from the coils?

Ask Your Own Lexus Question
Customer reply replied 1 year ago
Denso coils and wires. They are wired correctly as the vehicle runs fine most of the time. Just when I accelerate somewhat hard. I can duplicate the problem when I power brake and stomp on the gas pedal
Customer reply replied 1 year ago
Forgot to mention I also installed new injectors
Lexus Mechanic: mike switzer,
 replied 1 year ago

does your check engine light flash

Ask Your Own Lexus Question
Customer reply replied 1 year ago
I starts misfiring on #5, then moves to #1,#3
Lexus Mechanic: mike switzer,
 replied 1 year ago

just to verify what wires are going from which coil to which cylinder

Ask Your Own Lexus Question
Customer reply replied 1 year ago
2 coil feeds #5 wire, then #6 coil feeds #1, then #4 feeds #3
Lexus Mechanic: mike switzer,
 replied 1 year ago

okay i just wanted to verify. it could be a crank sensor causing this as well did it have this issue before or after the changing of the wires and were the plugs done?

Ask Your Own Lexus Question
Customer reply replied 1 year ago
Before
Customer reply replied 1 year ago
VVT solenoid also replaced.
Lexus Mechanic: mike switzer,
 replied 1 year ago

i would start with the crank sensor. and why did you change the vvt solenoid?

Ask Your Own Lexus Question
Customer reply replied 1 year ago
I had a code set for that early in the year. After replacing the code was cleared. Just wanted to mention all the new stuff
Customer reply replied 1 year ago
I'll try crank sensor, thanks
Lexus Mechanic: mike switzer,
 replied 1 year ago

sounds good let me know how things go.

Ask Your Own Lexus Question
Ask mike switzer Your Own Question
mike switzer
mike switzer
mike switzer
Category: Lexus
Satisfied Customers: 717
717 Satisfied Customers
Experience: lead diagnostic tech at Aamco

mike switzer 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

1,759 satisfied customers

Lexus Expert

Ron Z.

Ron Z.

- Lexus Tech -

423 satisfied customers

18+yrs experience. State Inspector and Lexus Diagnostics

Chris (aka - Moose)

Chris (aka - Moose)

Technician

297 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

217 satisfied customers

15+ years ASE Master w/L1 Drivability certification

Tim Mohr

Tim Mohr

ASE MASTER

125 satisfied customers

30 YEARS EXPERIENCE, FORIEGN AND DOMESTIC, GAS AND DIESEL

< Previous | Next >

Related Lexus Questions
Trying to replace the low beam D2S on the driver's side.
trying to replace the low beam D2S on the driver's side. Can't get enough access by removing the fender splash shield and also not enough room through the top even after freeing up the fuse/relay box … read more
Cesar Jimenez
Cesar Jimenez
Vocational, Technical or Trade School
2 satisfied customers
Does the lexus gs430 has an inherit light steering wheel
Does the lexus gs430 has an inherit light steering wheel problem, if so can it be modified or fixed… read more
Matt J
Matt J
Owner of Jones Automotive
Vocational, Technical or Trade Scho
1,000 satisfied customers
My daughter's 2001 RX300 was running poorly, with the engine
My daughter's 2001 RX300 was running poorly, with the engine light on. I went to auto zone, where they scanned it, showing misfires on 1,3,&5, as well as an A/F Sensor Circuit Range/Performance malfu … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
Just had Lexus LSwindshield changed by SafeLite and power
just had Lexus LS(###) ###-####windshield changed by SafeLite and power steering is not working - is there any possible relationship … read more
rpmdiag
rpmdiag
High school
7,109 satisfied customers
My VCS trac and Trac off along w check engine light came on.
My VCS trac and Trac off along w check engine light came on … read more
Ron Z.
Ron Z.
- Lexus Tech -
Vocational, Technical or Trade Scho
423 satisfied customers
My 1998 ls 400 has a vibration problem when In park at
my 1998 ls 400 has a vibration problem when In park at different rpms whats with that? … read more
Toyota Service
Toyota Service
Toyota Dealership Service & CR Manager
1,344 satisfied customers
HOW MANY CATALYTIC CONVERTERS ARE THERE IN LEXUS RX350 (YEAR
HOW MANY CATALYTIC CONVERTERS ARE THERE IN LEXUS RX350 (YEAR 2007) .THE COMPUTER READINGS INDICATED 420 & 430 ( BANK 1 AND BANK 2)THE MECHANIC SAID, THE CC ARE BAD AND NEED TO BE REPLACED. IS THIS TRU… read more
George H.
George H.
ASE Certified Technician
Associate Degree
217 satisfied customers
I recently replaced my brake rotors and pads on my car –
Hi, I recently replaced my brake rotors and pads on my car – brand new oem 14” Lexus rotors and pads. But shortly after a brake vibration came back. It is mainly at lower speeds less than 45mph when s… read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 satisfied customers
Lexus 2002 300RX Code:: Active Engine Code P0330 / Knock
Lexus 2002 300RX Code:: Active Engine Code P0330 / Knock Sensor 1 Circuit Bank 2...Thoughts… read more
Michael Solis
Michael Solis
247 satisfied customers
Ls430 code 2056 pcs axel gap... Pre collision system fault.
ls430 code 2056 pcs axel gap... Pre collision system fault. extracted above code, hard code, won't reset, something about axel gap and sensor... where are these sensors?… read more
LexusPro
LexusPro
Master Lexus Technician
1,031 satisfied customers
I have a 1998 Lexus. Ls400 with 136000 miles. Can a mechanic
ls400 with 136000 miles. Can a mechanic tell if the timing belt has been changed? … read more
Ron Z.
Ron Z.
- Lexus Tech -
Vocational, Technical or Trade Scho
423 satisfied customers
I own a 2016 Lexus RX350. I have noticed in the last few
Hi. I own a 2016 Lexus RX350. I have noticed in the last few days that the steering is feeling a bit stiff. … read more
Mechanic01
Mechanic01
1,141 satisfied customers
I have 2012 Lexus ES and two key fobs, neither of which
I have 2012 Lexus ES and two key fobs, neither of which work. One is fairly new (purchased about 5 months ago and never actually used. The other one I changed the battery. Neither on will lock/unlock … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
905 satisfied customers
C1201, P1120, c1223, c0200. 2000 gs 300. Just got codes.
I just had all of the codes pulled at Advanced Auto Parts … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
905 satisfied customers
IN NIGERIA ...THE CHECK ENGINE / VSC LIGHT IS ON MY
I AM BASED IN NIGERIA ...THE CHECK ENGINE / VSC LIGHT IS ON MY LEXUS(###) ###-####MODEL. COMPUTER READING INDICATED "THE CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD". MY QUESTIONS ARE; (1) HOW MUCH IS … read more
Chris (aka - Moose)
Chris (aka - Moose)
Technician
Vocational, Technical or Trade School
297 satisfied customers
My brake light was coming and I tapped up the fluid but I
Hi, my brake light was coming and I tapped up the fluid but I noticed the vsc/vsc off light wont go off; why … read more
Mechanic01
Mechanic01
1,141 satisfied customers
I purchased a 2006 Lexus Rx 350 SUV about 2 years ago. No
I purchased a 2006 Lexus Rx 350 SUV about 2 years ago. … read more
Todd M
Todd M
Owner
ASE Certification
1,286 satisfied customers
07 IS 350 has had 4 batteries in last 3 years charging shows
07 IS 350 has had 4 batteries in last 3 years charging shows 13.4 volts but shut engine off battery drops to 12.5 volts untill try to start and drops to 9.1 battery is only 9 months old again. … read more
Todd M
Todd M
Owner
ASE Certification
1,286 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