Question for the SubaruGuru


Asked by M4RKISHkilledME Sep 04, 2019 at 02:00 PM about the 2014 Subaru Impreza WRX Hatchback

Question type: Maintenance & Repair

I've had a recurring problem with these lights coming up on
my 2014 Impreza WRX Hatchback. Solid check engine,
blinking cruise control and solid VDC (Vehicle Dynamics
Control). First time I ahd the code read it said it was an o2
sensor, had it replaced, lights came on again a week later,
read the code and it said it was the same o2 sensor so they
replaced it again thinking the first was a bad one. 2 weeks
later the lights came up again, this time they did some
lengthy testing and found something was sending a large
volt of electricity to thag 02 sensor that was tripping it.
After searching all the wires they found a wiring harness
loose and after setting that back in and testing it for a few
more days the problem seemed to go away. Told me to
drive it for a month to see if it happened again. Well it didn't
for the whole month so I paid for their services and thought
I was good.. Until the lights came on again today. I'm super
frustrated and can't keep spending money on "fixes" that
don't actually fix the problem. I do get regular car washes
but the lights don't come on afterwards, it has always
happened the same way (I get to work, pull into a stall, pull
the ebrake to park and as my car sits idle it kind of
shudders a bit and the lights come on). Any ideas??

5 Answers


These lights are warning you of a problem. Without the trouble codes I could only guess at the reasons why they are on. O2 sensor codes can be set for a variety of reasons.


Well I know what the codes are there for, I'm just asking to see if anyone has any ideas as to why they keep coming up and reading the same code each time even though the problem should've been "fixed" with the first sensor replacement. If it's not the o2 sensor failing then what is sending the false code?


Sorry, but your 'Rex seems to have an emissions failure that I can't decipher from afar. On older NA motors with 5 O2 sensors it was common for an errant O2 sensor CEL to confuse diagnosis. It's unclear how an O2 sensor can receive a voltage spike. so I'd have another set of eyes and brain look at the connectors, harnesses, and fuse block. Hell, even check the ECM plugs in case this car was flooded in the past.

1 people found this helpful.

It's interesting how many threads exist for this topic. Lots of people seem to be having this issue with multiple different cars (I'm having it at the moment with a 2009 Forester, along with a loud clatter and rough idle at start up). I'm seeing this with Foresters, Imprezas, Crosstreks, and WRX. Don't they all use the same engine?


Will: I believe they do all use the same engine, not entirely sure though. GuruSW818: from what I knew about the car when I purchased it, there hadn't been any flooding but, I've had a few repairs done on it that would make it seem that to be the case. I purchased this car as a rebuilt and am starting to wonder about the whole integrity of their build.. Sadly I'm now stuck with it not knowing things like this before buying it. I am going to be taking it to an actual Subaru shop this coming weekend and having them take a gander to see if they can figure out what's going on.

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