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Old 11-01-2018, 08:24 PM   #1
TheDecline
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Default 2012 Subaru Impreza needs new oxygen and air fuel sensor after a week at the dealer

Long story short, I'm getting my short block replaced for the second time after excessive oil consumption. Yesterday after getting my car back after a week at the dealer my check engine light comes on. I bring it back, they said that my oxygen and air fuel sensors need to be replaced but it isn't related to the work they finished 24 hours prior as those parts aren't near the area that was worked on.

Do you think this is a coincidence or are they trying to cover their mistake?
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Old 11-02-2018, 07:28 AM   #2
rtv900
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two motor replacements in 6 years?

Do you think they are the ones covering their mistakes or maybe you beat your car to an oblivion and expect it to function properly?
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Old 11-02-2018, 07:45 AM   #3
TheDecline
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two motor replacements in 6 years?

Do you think they are the ones covering their mistakes or maybe you beat your car to an oblivion and expect it to function properly?
Both replacements were covered under warranty. My engine needed about 1 quart of oil every 2000-3000KM, it is a known problem with that year of Impreza. Also, I drive about 15000KM a year, so I'm really not abusing it.
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Old 11-02-2018, 08:31 AM   #4
rtv900
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ok, maybe you aren't.
But it's hard to believe they'd provide a free engine for a quart every 2200 miles as that isn't really crazy excessive. I thought oil usage was something specifically quantified in the manual or somewhere so that there was a clear figure to go by.
I drive 25,000 miles a year so that doesn't sound like that much.
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Old 11-02-2018, 08:33 AM   #5
Obviously Tyler
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Originally Posted by rtv900 View Post
two motor replacements in 6 years?

Do you think they are the ones covering their mistakes or maybe you beat your car to an oblivion and expect it to function properly?
Why are you so combative in every thread that you post in?

Some of the early FB cars had serious oil consumption problems. Look it up.
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Old 11-02-2018, 08:35 AM   #6
Obviously Tyler
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Quote:
Originally Posted by TheDecline View Post
Long story short, I'm getting my short block replaced for the second time after excessive oil consumption. Yesterday after getting my car back after a week at the dealer my check engine light comes on. I bring it back, they said that my oxygen and air fuel sensors need to be replaced but it isn't related to the work they finished 24 hours prior as those parts aren't near the area that was worked on.

Do you think this is a coincidence or are they trying to cover their mistake?
I don't know how much of the exhaust actually has to be touched and removed to replace the engine, but there's really no way to know if they broke something. How many miles on the car? These are both items that can and will go bad after awhile.

My guess, unfortunately, is coincidence.
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Old 11-02-2018, 09:01 AM   #7
TheDecline
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I don't know how much of the exhaust actually has to be touched and removed to replace the engine, but there's really no way to know if they broke something. How many miles on the car? These are both items that can and will go bad after awhile.

My guess, unfortunately, is coincidence.
I'm at about 68000 miles, so if we're nearing the end of life for those parts I can accept that and just do my best to find an indie shop to do the replacement. The dealer was quoting me ~$900 CAD for the job.
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Old 11-02-2018, 09:02 AM   #8
TheDecline
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ok, maybe you aren't.
But it's hard to believe they'd provide a free engine for a quart every 2200 miles as that isn't really crazy excessive. I thought oil usage was something specifically quantified in the manual or somewhere so that there was a clear figure to go by.
I drive 25,000 miles a year so that doesn't sound like that much.
I wish I got 2200 miles out the oil. It is more like 2200KM, so like 1400 miles.
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Old 11-02-2018, 09:11 AM   #9
Obviously Tyler
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Originally Posted by TheDecline View Post
I'm at about 68000 miles, so if we're nearing the end of life for those parts I can accept that and just do my best to find an indie shop to do the replacement. The dealer was quoting me ~$900 CAD for the job.
My other guess is that if any of the burned up oil is making it's way through your exhaust, it could be fouling up those sensors prematurely.

But that's usually caused by an oil leak in the combustion chamber. Not sure if burning oil would cause this in the same manner.
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Old 11-02-2018, 09:59 AM   #10
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Why are you so combative in every thread that you post in?

Some of the early FB cars had serious oil consumption problems. Look it up.
combative? I guess.

You don't agree 2 engines in 6 years seems a little off?

I've driven 3 cars in the last 20 years over 700,000 miles and never needed even one engine let alone 2 per 60k.
And I've never known a single person with a passenger vehicle in real life (internet users not included) who needed a replacement engine.

Call it combative if you want, I'm basing my comments on real world experience.

Does your experience suggest that is normal and realistic? I'm genuinely curious what your personal experience is if that is the case.
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Old 11-02-2018, 10:07 AM   #11
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This is the FB engine where SOA tells dealers to do an oil change and check in 1200 miles. If oil is down 10 ounces or more, replace the engine. I haven't measured yet with our 13 Crosstrek, but would not be surprised if it doesn't meet that usage. To me, it just means to add a quart when it's down. Fortunately, unlike the EJ, an oil light doesn't mean "you just lunched your engine". You can actually continue driving to the next gas station to buy oil.
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Old 11-03-2018, 03:34 AM   #12
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Quote:
Originally Posted by TheDecline View Post
Long story short, I'm getting my short block replaced for the second time after excessive oil consumption. Yesterday after getting my car back after a week at the dealer my check engine light comes on. I bring it back, they said that my oxygen and air fuel sensors need to be replaced but it isn't related to the work they finished 24 hours prior as those parts aren't near the area that was worked on.

Do you think this is a coincidence or are they trying to cover their mistake?
You're right that it is suspiciously close to your last service visit. But I can't imagine what would foul them up after only one week so it's more likely an age issue and just a coincidence. There was a repair place I tried once where every time I went, a week or two later something else would go wrong. The first time I attributed it to coincidence, the second time it was highly suspicious, and then the third time I found another repair place.
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Old 05-20-2019, 01:41 PM   #13
wrx17z
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Quote:
Originally Posted by TheDecline View Post
Long story short, I'm getting my short block replaced for the second time after excessive oil consumption. Yesterday after getting my car back after a week at the dealer my check engine light comes on. I bring it back, they said that my oxygen and air fuel sensors need to be replaced but it isn't related to the work they finished 24 hours prior as those parts aren't near the area that was worked on.

Do you think this is a coincidence or are they trying to cover their mistake?
I don't know is this a stupid question. Is O2 Sensor and Air Fuel Sensors different?
my check engine light was on( WRX'18). Went to the dealer, told me to replace O2 Sensor, 2 weeks later, engine light on again. This time tell me Air Fuel Sensors. I am finding hard time to believe it, but i am no expert at all.
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Old 05-20-2019, 03:24 PM   #14
Charlie-III
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Quote:
Originally Posted by wrx17z View Post
I don't know is this a stupid question. Is O2 Sensor and Air Fuel Sensors different?
my check engine light was on( WRX'18). Went to the dealer, told me to replace O2 Sensor, 2 weeks later, engine light on again. This time tell me Air Fuel Sensors. I am finding hard time to believe it, but i am no expert at all.
Most recent cars have at least 2 O2 sensors.
The upstream is mostly used for fueling (AFR sensor) and downstream is usually more for checking the CAT.

Thus, we ask for actual codes, NOT "what it describes".

Yes, burning a lot of oil could foul either O2 sensor as well as hurt the CAT longterm.
Maybe ask nicely if the sensor could be covered through warranty because of the oil burn.
Usually emissions related stuff is covered 10 years/100K miles...
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Old 05-20-2019, 03:31 PM   #15
Jack
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Since my last post in this thread, I've had a new, shiny sort block replaced in our 13 Crosstrek under warranty. While having wheel bearings replaced before this at our regular independent mechanic (who does any work I can't do or figure out), he mentioned that with the oil consumption, we might expect a P0420 (the "I'm a Surbaru" code) for cat below efficiency. So I got that to look forward to.
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