Question about 2003 Subaru Outback

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Check engine light stays on. Mechanic replaced o2 sensor. Light went off but cam back on within 2 days

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What code did it set the first time? what code the second time? wanna give us some more info there?

Posted on Aug 22, 2010

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Posted on Jan 02, 2017

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What are codes P0133 & P1134, for a 2005 Buick Lacrosse 3.8L V6 with 94,000 miles.


i have replaced an O2 sensor and had similar failure after 1500 miles.
I removed it, chkd it, reinstalled it and it ran fine.
P0133 is related to slow response of O2 sensor. P1134 is mfg specific so google that for ur car.

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After your mechanic replace the Cam Angle Sensor, did he reset the fault code to 00. If yes and the light went off and stayed off for a while then came back on later it may be the O2 sensor.

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check engine light on when tested it says bad o2 sensor did you replace 02 sensor it takes driveing it so many miles before light will go off give it couple days you dont need cadillac converter check engine light will go off cv joint they click as you turn dont let a mechanic sell you something you dont need its very rare for cadillac converters to go bad its common for o2 sensors to go bad like yours did but when 02 sensors are replaced it takes driveing it for awhile before it resets itself you also have more then one 02 sensor was then wrong one replaced they screw into your exaust manifold

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1 Answer

Check Engine Light stays on. Went to Advance Auto


When your air fuel mixture is out of adjustment it triggers the ECU to adjust your fuel mix . You are likely dealing with either a clogged O2 sensor or fouled throttle body at the end of the intake snorkel however I have not seen mine cause any issues with braking.
A code reader will need to be used to take an initial reading and to erase current fault codes , adjusting the engine back to default settings. This should erase the warning light and allow you to start fresh.
When my front O2 sensor failed the fuel ratio had adjusted to compensate for the mis read and I was running at almost 50% fuel to air instead of 7% range at idle. I watched the readouts as the ECU adjusted the fuel mixture back down within 2 minutes on my RX300 after changing the O2 Sensor and all has been well since. The reader will identify if your issue rests with any of the 3 sensors or in another area. Upgrading 1 sensor will change how the remaining old ones function as well

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Engine warning light on Mazda MPV 2002


There seem to be 4 sensors along the way in the air intake and emissions system.

My Check Engine light indicated a bad sensor 1, bank 2 code (I think).

I had my mechanic replace the sensor that was indicated as faulty... cost = $191.

Then the Check Engine light came on again (with a different code), and I had to leave the van with him all day.

Cost to replace and install that sensor = $115.

My advice: if the Check Engine light stays on *AND* your vehicle is riding rough, get it fixed.

Otherwise, put a piece of tape over that Check Engine light and save a couple hundred dollars!

Hope this helps, I do trust my mechanic fully.

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1 Answer

Volvo S-60 03, non turbo B5244S, has had check engine light on for years, replaced front O2 sensor, reading is a ECM 4201. One volvo mechanic states replace fuel injectors first, another mechanic states to...


Replace the cat you have ran it for years with a bad 02 sensor so now replace it and you will get better performance and better gas miliage. Never run a check engine light fo a long time it's telling you something is wrong. youer lucky you did not destroy the engine.

Jul 16, 2009 | 2003 Volvo S60

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