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Old 08-26-2006, 09:00 PM   #1
fujiwara_yingyu
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Default engine check light was on

i changed my car's header and catback in may...yesterday the engine check light was on , i don't have any idea, could anyone help me to answer this question?
my car is 98 2.5rs
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Old 08-26-2006, 09:01 PM   #2
fujiwara_yingyu
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one of dude says: More than likely, it is the P0420 Cat inefficiency code. It is a VERY common code for a Subaru and isn't anything to worry about. Keeping it off once it flashes is about impossible, but have the code pulled to be sure.
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Old 08-26-2006, 10:04 PM   #3
horrorbiz
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Is your car acting funny? It could be anything, your best bet is to go have the code pulled.
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Old 08-26-2006, 10:56 PM   #4
LetItSnow
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How is this different than when you posted it here?

The other "dude" (me) said "We can't do a thing to help you until you get the code pulled." It still holds true. Get the code pulled.
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Old 08-28-2006, 07:47 AM   #5
fujiwara_yingyu
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code: 0163 auto sensor...
the auto sensor need to be changed...
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Old 08-28-2006, 09:17 PM   #6
LetItSnow
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The oxygen sensor, actually.

P0163 - O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
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Old 08-29-2006, 09:51 AM   #7
fujiwara_yingyu
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how much for one sensor tho??i don't have any ideas
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Old 08-29-2006, 10:41 AM   #8
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$100ish I believe.
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Old 08-29-2006, 06:28 PM   #9
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Quote:
Originally Posted by fujiwara_yingyu View Post
how much for one sensor tho??i don't have any ideas
Best way to find this out is to go to a parts store and tell them what you need, they will tell you what it costs.
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Old 08-29-2006, 08:23 PM   #10
fujiwara_yingyu
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NGK and Bosch sensor bosch is 149 canadian$, Ngk is 165 canadian dollar, which one is better ?
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Old 08-30-2006, 05:26 AM   #11
fujiwara_yingyu
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where is the oxygen sensor around engine area?? i want to change it by myself
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Old 08-30-2006, 08:33 PM   #12
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Doesn't matter which one, alot of people run Bosch.

Both o2 sensors will be in your exhaust cat. section. You will need a special socket to make the job easy, which you can get at the parts store. Be prepared for them to be tough to get out.
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Old 09-01-2006, 04:26 AM   #13
fujiwara_yingyu
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i changed the front o2sensor already,but how can i reset the ECU. i heard the classic impreza has a different way to reset...damn, the lihgt is still on, and i scanned again, no code is on.
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Old 09-01-2006, 04:21 PM   #14
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un-hook the negative battery cable and let it set for 15-20 mins. That should do it.
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Old 09-10-2006, 06:05 AM   #15
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i got a brand new ntk o2 sensor, that one is the front one... and i changed it, but the engine check light is still on.
i guess does the rear sensor broke as well??? will the rear o2sensor influence the light on?? i don't have any idea. by the way my car's header also changed, but the engine check light was not on when i install the aftermarket header. anyone can help me to answer why my car's engine check light was on???
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Old 09-10-2006, 10:11 AM   #16
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go have it scanned again, see what the code is...then go from there. They can turn the light off as well. We cant help if we don't know what the code is this time.
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Old 09-10-2006, 10:31 AM   #17
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P0163 - O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
what does "Bank 2 Sensor 3" mean?
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Old 09-10-2006, 10:37 AM   #18
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i will scan again
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Old 09-10-2006, 06:37 PM   #19
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today i scan the code again
p0136 O2 sensor circuit malfunction

the front sensor is brand one, i just changed it
but the light is still on? is that the rear one problem or the front sensor wire are loose or some connection problems??
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Old 09-10-2006, 06:44 PM   #20
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Quote:
Originally Posted by william41cn View Post
today i scan the code again
p0136 O2 sensor circuit malfunction

the front sensor is brand one, i just changed it
but the light is still on? is that the rear one problem or the front sensor wire are loose or some connection problems??
Well...I used that handy dandy search function and came up with a slew of threads that said a "P0136" code is the rear O2 sensor.

So you need to replace that sensor, or consider one of those MIL eliminator fixes(a bit cheaper). For the MIL eliminator...do a search.
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Old 09-10-2006, 07:35 PM   #21
william41cn
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Quote:
Originally Posted by Charge View Post
Well...I used that handy dandy search function and came up with a slew of threads that said a "P0136" code is the rear O2 sensor.

So you need to replace that sensor, or consider one of those MIL eliminator fixes(a bit cheaper). For the MIL eliminator...do a search.
thx , search is really useful to me
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