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#4632780 - 01/12/18 06:20 PM PO133 vs. PO171 Leaking Intake Manifold Gasket
willbur Offline


Registered: 06/06/13
Posts: 289
Loc: sw ohio
Greetings All-
my 04 Vibe/Toyota Matrix/Corolla 1.8 lit up CEL. Stored Code was PO133- O2 sensor (front) slow response. Toyota TSB indicated likely cause was a leaking intake manifold gasket in cold weather (common problem). My question: why code PO133 (slow O2 response) and not PO171 (lean mixture)? PO171 makes a lot more sense than a slow responding O2 sensor.

Repair is very simple and minimal cost ($3.50) for Fel-Pro Gasket.

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#4632808 - 01/12/18 06:38 PM Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: willbur]
das_peikko Offline


Registered: 01/01/18
Posts: 534
Loc: San Antonio, TX
Nevertheless, as long as you're not getting coolant mixed in with your oil, you should be happy.

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#4632837 - 01/12/18 07:04 PM Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: willbur]
Leo99 Offline


Registered: 03/30/14
Posts: 3112
Loc: NJ
I replaced that gasket on my Corolla due to a CEL. I forget the code number. It is a very simple repair.
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Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles
2004 Rav4 359,000 miles
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#4632876 - 01/12/18 07:36 PM Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: willbur]
Rolla07 Offline


Registered: 11/05/11
Posts: 4752
Loc: MTL, CANADA
I did get the PO171 about 4 years ago. The P0133 could be linked to same thing. If you never replaced the gasket, may as well replace it first and clear the code and see if it comes back. If you havent done it yet.. it wont hurt to clean the MAF airflow sensor and the throttle body if it hasnt been done in awhile. Not to say its linked to your issue.


Edited by Rolla07 (01/12/18 07:36 PM)
_________________________
2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967


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#4632908 - 01/12/18 07:57 PM Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: willbur]
barkingspider Offline


Registered: 12/22/13
Posts: 2064
Loc: socal
Replace the manifold gasket and the tensioner o ring, clear the code and see if it comes back. If it does, u may need new O2 sensor
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#4633007 - 01/12/18 09:03 PM Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: barkingspider]
willbur Offline


Registered: 06/06/13
Posts: 289
Loc: sw ohio
Thanks All-
I initially bought an O2 sensor (OE Denso) thinking since the car has 120k miles on it, the O2 sensor has got to be lazy and responding slowly and it would not hurt to replace it. The PO133 code convinced me, too. I have been aware for a long time the leaking intake gasket is a known problem but because the car ran so well (and still does), why mess with it. I guess now is the time.

Just curious about the codes..

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