Subaru

Have Subaru questions? Ask a Subaru mechanic and get answers ASAP

Ask an Expert,
Get an Answer ASAP!

I have a 2008 Subaru Outback. I recently had the car into…

Customer Question
I have a 2008...

I have a 2008 Subaru Outback. I recently had the car into the dealership for its 175,000 mile check up. The car's gas mileage dropped from 24-26 mpg to around 20 mpg prior to my bringing it in. They replaced the spark plugs, changed out the engine air filter, and changed the oil and filters. I drove the car 30-40 minutes on highway and surface streets to my folks and then parked the car. When I started back up I got the CEL. I took it back to the dealership the next day thinking it was related to the service. They looked it over and said they didn't find anything wrong and cleared the code. After receiving the car back I noticed that the car would shudder when I stopped (like it was going to stall out), but then the RPMs would pick back up to normal idle. I drove it back up to my folks and when I restarted the car after being parked the CEL came back on. With the CEL on, the car no longer shudders when coming to a stop. I'm thinking this has to do with one of the O2 sensors, but figured I'd get your thoughts.

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Car has 176,000 miles as of this morning. This is the first time this car has had this problem and had been running well through 174,000 miles.

Submitted: 2 years ago.Category: Subaru
Show More
Show Less
Ask Your Own Subaru Question
Answered in 1 hour by:
1/29/2016
Subaru Mechanic: peterpete190, Auto Technician replied 2 years ago
peterpete190
peterpete190, Auto Technician
Category: Subaru
Satisfied Customers: 32,127
Experience: Auto repair Technician with 17 years experience.Past ASE and other certifications.
Verified

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

With the check engine light on there is at least one fault code set.Since the dealer says there was no code or issues I would have the codes checked/read out by another facility to see what codes are set.You might have a parts store like Auto Zone read out the codes as they usually will free of charge for you.If you can get the codes read out and post the code info here this will help just let me know.

With a studder and if this issue only occurred after the service was done this may be an issue with a damaged spark plug they had replaced as this can occur in some cases here.I have seen this occur before and had to re replace the affected spark plug.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Ask Your Own Subaru Question
Customer reply replied 2 years ago
Sorry, the dealer was the one who initially ran the diagnostics on the car and pulled the P2097 code. They said the code didn't make sense to them based on the condition of the car/maintenance they just did and, after looking over the catalytic converter and surrounding equipment and finding nothing wrong, they cleared the code so the CEL wouldn't come back on. Would the spark plug issue cause this sort of code to pop up?
Subaru Mechanic: peterpete190, Auto Technician replied 2 years ago

Can you tell me what liter engine is in this model here as I see two options including a turbo option?

Ask Your Own Subaru Question
Customer reply replied 2 years ago
2.5 liter
Customer reply replied 2 years ago
Non turbo
Subaru Mechanic: peterpete190, Auto Technician replied 2 years ago

O.k.,this code indicates the fuel trim post converter is to rich on bank 1 side of the engine.The spark plugs usually wont cause this code to set unless the engine is running rough.What can cause this code is the post catalytic converter oxygen sensor reading incorrectly needing replaced or the catalytic converter itself.Usually this code wont be related to the work that was done unless they unplugged the wiring for this oxygen sensor accidentally or damaged the wiring or sensor.Your model has a front cat. and a rear cat.This would be the front cat.

The computer will try and compensate for the rich code by leaning out the fuel supplied to the engine which can cause this studder and near stall out.Since the light did come back on again after it was cleared this will have to be tested/checked into further to see if the oxygen sensor needs replaced or if there is an issue with the catalytic converter itself needing replaced.

Thanks Pete

Ask Your Own Subaru Question
Customer reply replied 2 years ago
Okay, that is sort of what I expected based on the information I got back from the dealer when they initially checked it out and my previous experience with a Subaru Baja. Thank you for the help.
Subaru Mechanic: peterpete190, Auto Technician replied 2 years ago

Your welcome.Let me know if you need anything else and feel free to rate my help here.

Thanks Pete

Ask Your Own Subaru Question
Was this answer helpful?
Ask peterpete190 Your Own Question
peterpete190
peterpete190
peterpete190, Auto Technician
Category: Subaru
Satisfied Customers: 32,127
32,127 Satisfied Customers
Experience: Auto repair Technician with 17 years experience.Past ASE and other certifications.

peterpete190 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:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

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

< Previous | Next >

Meet the Experts:

Kevin C.

Kevin C.

Subaru Master Tech.

1,727 satisfied customers

34 years of Subaru service experience, ASE Master Technician.

George H.

George H.

Subaru Certified Technician

1,330 satisfied customers

ASE Master Tech 15 + Years

Tim Mohr

Tim Mohr

ASE MASTER TECH

409 satisfied customers

30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

Matt

Matt

Engineer

360 satisfied customers

Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing

Chris(aka-Moose)

Chris(aka-Moose)

Subaru Technician

289 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- Subaru Tech -

239 satisfied customers

18+yrs experience. State Inspector and Subaru Diagnostics

Don - Mo Lurch

Don - Mo Lurch

Subaru Mechanic

190 satisfied customers

Heavy Line Mech, Race Shop Owner, Mobile Electronics.

< Previous | Next >

Related Subaru Questions
Subaru Outback 2.5I Basic: What do $7E8 and $7E9 codes mean
What do $7E8 and $7E9 codes mean on my 2012 Subaru Outback ?… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
2003 subaru: wrx..it will crank but wont start..getting fuel
i have a 2003 subaru wrx. it will crank but wont start. i checked for fuel, and i am getting fuel. but i amnot getting spark. i just replaced the crank position sensor, it didnt help . is there anythi… read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
How do you change the spark plugs on a 1999 subaru outback. They
How do you change the spark plugs on a 1999 subaru outback. They seem to be totally non accessible especially the drivers side rear… read more
Alan
Alan
Technician
High School or GED
262 satisfied customers
I am trying to change spark plugs and one doesn't come out
I am trying to change spark plugs and one doesn't come out after I loosen it with a socket. … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
Changed my spark plugs on my 2013 impreza and now running
changed my spark plugs on my 2013 impreza and now running rough, check engine lights and cruise control lights on and getting codes P0301 and P0302 codes … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
2001 outback failed to start and had oil on spark plug
2001 outback failed to start and had oil on spark plug wires, so changed spark plugs, wires, spark plug tube seals and valve cover gaskets. But still work start. Changed ignition coil, but still no. … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
I have a 2014 Subaru outback. one of the four spark plugs is
I have a 2014 Subaru outback. one of the four spark plugs is not grab-able with a spark plug socket. It does not appear that the socket is seating on the plug as you do not get that click feel when in… read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
I have problems with the spark in spark plugs there is no
I have problems with the spark in spark plugs there is no spark in my 2005 subaru 3.0 … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
Gary I am wondering which spark plugs would be best for my
Hello Gary I am wondering which spark plugs would be best for my wrx. Just bought the car and havent had it on dyno. Have a bigger turbo aith pink sti injectors, I'm guessing right around 300 hp. Not … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
91 satisfied customers
Had a misfire in cylinder 6 I have replaced all spark plugs
had a misfire in cylinder 6 I have replaced all spark plugs in all cylinders as well as the replaced the Ignition coil for cylinder 6. However it is still pulling a p0306 code on that cylinder. The ca… read more
tamaz22
tamaz22
60 satisfied customers
My boyfriend changed my spark plugs in my Subaru and now my
My boyfriend changed my spark plugs in my Subaru and now my car won't even start … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
I have just bought a 1998 and the spark plug lead on the
i have just bought a 1998 foster and the spark plug lead on the passengers keeps on jumping off you drive about 1klm on the dam thing is off ,i have swaped the leads and it did not work … read more
Chris(aka-Moose)
Chris(aka-Moose)
Subaru Technician
Vocational, Technical or Trade School
289 satisfied customers
Spark plug stuck in engine. 2000 model, manual 300,000 km,
Just looked at it. Friend says try soak it with WD40 … read more
Brandon
Brandon
93 satisfied customers
burn off procedure
burn off procedure… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
2005 Subaru Outback: P0302..P0304..high mileage..turbo s
2005 Subaru Outback; P0302/P0304. I have just purchased a used OB with high mileage and an engine light, many Subaru enthusiasts say this is notorious on turbos. How do I fox this?… read more
Alex M
Alex M
Automotive Technician
Diplom
858 satisfied customers
what is the spark plug gap for subaru outback 2003 4 cylin
what is the spark plug gap for subaru outback 2003 4 cylinder… read more
Arench
Arench
President
CT State GED w/ Honors
1 satisfied customers
2008 Subaru Forester: base model..Today out of the blue it wont start
I have a 2008 Subaru Forester base model. It has about 55000k on it. Today out of the blue it won't start… read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
i need to change the spark plugs on a 06 subaru baja turbo...what
i need to change the spark plugs on a 06 subaru baja turbo...what do i need to look for n remove to get to them...n how do i remove them… read more
baddad1
baddad1
technician
High School or GED
5 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