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Guest Message by DevFuse

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Subaru 2000 Outback---error code P1133

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10 replies to this topic

#1 bentonjim


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Posted 27 August 2006 - 08:53 AM

I have a 2000 Subaru Outback (purchased it new), automatic transmission and now have 96,000 miles on it. Recently the CHECK ENGINE light comes on and stays on even though the car runs fine and is getting normal gas milage. I purchased an Equus code reader and it indicates an error code of P1133. This particular error code is not listed in the official Subaru manual for this particular year equpped with automatic transmission. It does list P1131 and P1134 codes and mentions they are associated with front and rear oxygen sensors. If anyone has any additional info on this error code P1133 I would certainly appreciate more information. You can email me direct if desired: bentonjim@aol.com


#2 BigMattyD


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Posted 28 August 2006 - 07:58 PM

here is a diagnostic chart for p1133 from your year vehicle.


Attached Files

#3 sea#3


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Posted 28 August 2006 - 09:07 PM

Check with the dealer there may be an oustanding recall on the front (A/F) sensor
Get your VIN # and phone it in and see


#4 cannonball


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Posted 29 August 2006 - 09:22 AM

I notice in the attached file that it says to shake the wiring harness and monitor the voltage to see if it moves more than 8 volts. Why would shaking the harness have anything to do with voltage unless Subaru is saying that the harness could be faulty(shorted)? Am I reading that correctly?

#5 porcupine73


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Posted 29 August 2006 - 11:25 AM

It's not necessarily that the harness is shorting pins, it's probably more likely to fail open, or if there's any corrosion in there it will exhibit more resistance than is ideal.

P1133 is in the OE manual for '00OBW; it says DTC P1133 - FRONT OXYGEN (A/F) SENSOR HEATER CIRCUIT HIGH INPUT. (sorry about the caps-cut&paste).

As already mentioned there was a recall on the front o2 sensors where they'll replace it for free (some piece can break off or something I think); so if it hasn't been done yet and your vehicle was included might as well get it done.

#6 cookie


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Posted 29 August 2006 - 11:28 AM

But if it's not free I think my front sensor was about $60 and it is not that hard to change. My first move would be to change it because it is a consumeable and and a 2000 model should be about done anyway.

#7 Richard1296


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Posted 19 November 2006 - 09:55 AM

Is the info the same for auto transmission as for manual.
I would expect so but I hate to troubleshoot and then find
there was a difference.
or could you post it for an auto'


#8 afeinstein


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Posted 10 October 2011 - 01:16 PM

Seems the use of a fuel-air ratio sensor is specific for the MT Legacy.

I had this same code P1133 and the OBDII said however (LOW) below and I was able to clear the code by replacing the sensor. Used a Denso 234-9018. Do not buy a UNIVERSAL O2 sensor. It will NOT work!! Needs to be OEM on this car. Believe me I tried it. The OE unit made by Denso can be bought at auto parts stores and is the same as the dealer OE part. 3x check that they sell you the right unit for a MT Legacy which is not the same at the AT one.

It seems the diagnostics pathway attached above is just for a high condition.

My Legacy had 115k, started to smell a little rich, and then on cold mornings, idle RPM would be very high for a few minutes and then when the car warmed was fine. Seems that both the sensor heater was messed up as well as the actual o2 sensor part.

The sensor came out easily despite the awkard angle.

I spend hours on mind so wanted to at least share my experiences.

#9 ocei77


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Posted 10 October 2011 - 04:22 PM

Bosch( the originators of O2 sensors) will also work with no problems.

Let the car idle a few minutes and hold the bung with an open end wrench, then turn sensor.


#10 Crashbox


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Posted 09 June 2012 - 11:29 PM

One of the things I'm in the habit of doing when diagnosing an o2 heater fault, or any heater related fault, is ohm test the heater in the o2. Open or shorted heaters are common, and computers can set a variety of heater circuit codes.

#11 glennb



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Posted 12 February 2016 - 11:47 AM

This statement below is correct. If you have the MT (manual transmission) version of the subaru outback you have the dual inline cats.


You must replace the front sensor with a factory OEM to get everything working right. Be prepared to pay $150 to $180 for it.


That said the rear is just a plain oxygen sensor and an oem good equivalent will work.


>>>Seems the use of a fuel-air ratio sensor is specific for the MT Legacy.

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