????? about O2 senser

impresivesoob · 04-13-2004, 12:37 PM

About three months ago my check engine light came on and was found to be my O2 senser. My car didn't run rough or anything. I had it replaced and was told that it could have gone bad due to my aftermarket exhaust. (Borla)
So now yesterday my check engine light came on again, still isn't running rough so, I'm worried that it's going to be the same problem (O2 senser). My question is, does having aftermarket exhaust make this problem occur?? And if so, can I do anything about it, without getting rid of my exhaust?? Has anyone else had this problem? I don't have $200.00 for a new O2 senser every three months.

* Registered users of the site do not see these ads.

00RScoupe · 04-13-2004, 12:55 PM

If you havn't had the code pulled you don't know anything.

Since you have Borla headers you could just be getting the P0420 or catylist inefficiency CEL. This is very common. If you do pull the code and find your just like most people with aftermarket headers then go to this thread and check out your options.
http://www.rs25.com/forums/showthrea...threadid=14402

A few of us are trying a mechanical fix that was originally designed for WRXs. So far so good on my car. Been CEL free for right at 400 miles which is more than I got with the PEP MIL eliminator. Currently using the O2 extender from Flat4.

BlkTS02 · 04-13-2004, 01:36 PM

Autozone can get the rear 02 sensor for a '98 impreza (I'm assuming they're still using the same one through '04) for $55 for a generic one or $65 for the sensor with a oem plug.

bigdweeb · 04-13-2004, 01:42 PM

I kinda think MY98 may have used a 3 wire connector. The Autozone around me said they didn't stock a sensor for my car and they weren't too clear if they could actually order one for me.

ttboy19 · 04-14-2004, 12:07 AM

Check out pony express. MIL Eliminator. Don't think your catback is to blame.

impresivesoob · 04-14-2004, 02:36 AM

I don't have borla headers just cat back exhaust

04-13-2004, 12:37 PM	#1
impresivesoob Scooby Newbie Member#: 25672 Join Date: Oct 2002 Location: Minneapolis, MN Vehicle: 00 2.5 rs blue ridge pearl	????? about O2 senser About three months ago my check engine light came on and was found to be my O2 senser. My car didn't run rough or anything. I had it replaced and was told that it could have gone bad due to my aftermarket exhaust. (Borla) So now yesterday my check engine light came on again, still isn't running rough so, I'm worried that it's going to be the same problem (O2 senser). My question is, does having aftermarket exhaust make this problem occur?? And if so, can I do anything about it, without getting rid of my exhaust?? Has anyone else had this problem? I don't have $200.00 for a new O2 senser every three months. * Registered users of the site do not see these ads. Last edited by impresivesoob; 04-13-2004 at 12:45 PM.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
O2 senser problem...any suggestions?	Subi01	Service & Maintenance	1	01-26-2004 07:55 AM
Looking For Rear O2 Senser Resister setup	Andreas Miko	Factory 2.5L Turbo Powertrain	6	10-25-2003 09:55 PM
What size nut is the O2 senser??	WRBLUEWAGON	Factory 2.0L Turbo Powertrain	7	02-05-2002 07:30 AM
o2 senser	nolimitski	Mid West Subaru Owners Club Forum -- MWSOC	0	01-29-2002 11:44 PM
('93-'01) O2 Senser #6 Baby	STORER	Impreza Forum	14	10-11-2001 05:36 PM

04-13-2004, 12:55 PM	#2
00RScoupe Scooby Newbie Member#: 57535 Join Date: Mar 2004 Location: Topeka, KS Vehicle: 2004 FXT Maroon	If you havn't had the code pulled you don't know anything. Since you have Borla headers you could just be getting the P0420 or catylist inefficiency CEL. This is very common. If you do pull the code and find your just like most people with aftermarket headers then go to this thread and check out your options. http://www.rs25.com/forums/showthrea...threadid=14402 A few of us are trying a mechanical fix that was originally designed for WRXs. So far so good on my car. Been CEL free for right at 400 miles which is more than I got with the PEP MIL eliminator. Currently using the O2 extender from Flat4.

04-13-2004, 01:36 PM	#3
BlkTS02 Scooby Specialist Member#: 50142 Join Date: Dec 2003 Chapter/Region: South East Location: West TN Vehicle: 2002 2.5TS MBP	Autozone can get the rear 02 sensor for a '98 impreza (I'm assuming they're still using the same one through '04) for $55 for a generic one or $65 for the sensor with a oem plug.

04-13-2004, 01:42 PM	#4
bigdweeb Scooby Specialist Member#: 31035 Join Date: Dec 2002 Chapter/Region: NESIC Location: Boston Vehicle: 13 Ford Explorer 13 Mazda3 Skyactiv	I kinda think MY98 may have used a 3 wire connector. The Autozone around me said they didn't stock a sensor for my car and they weren't too clear if they could actually order one for me.

04-14-2004, 12:07 AM	#5
ttboy19 Scooby Specialist Member#: 38043 Join Date: Jun 2003 Chapter/Region: Tri-State Location: New Jersey Vehicle: 2004 impreza rs4sale '10 Legacy 2.5GT	Check out pony express. MIL Eliminator. Don't think your catback is to blame.

04-14-2004, 02:36 AM	#6
impresivesoob Scooby Newbie Member#: 25672 Join Date: Oct 2002 Location: Minneapolis, MN Vehicle: 00 2.5 rs blue ridge pearl	I don't have borla headers just cat back exhaust