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PO133 vs. PO171 Leaking Intake Manifold Gasket #4632780
01/12/18 07:20 PM
01/12/18 07:20 PM
Joined: Jun 2013
Posts: 298
sw ohio
willbur Offline OP
willbur  Offline OP
Joined: Jun 2013
Posts: 298
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.

Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: willbur] #4632808
01/12/18 07:38 PM
01/12/18 07:38 PM
Joined: Jan 2018
Posts: 534
San Antonio, TX
das_peikko Offline
das_peikko  Offline
Joined: Jan 2018
Posts: 534
San Antonio, TX
Nevertheless, as long as you're not getting coolant mixed in with your oil, you should be happy.

Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: willbur] #4632837
01/12/18 08:04 PM
01/12/18 08:04 PM
Joined: Mar 2014
Posts: 3,268
NJ
Leo99 Offline
Leo99  Offline
Joined: Mar 2014
Posts: 3,268
NJ
I replaced that gasket on my Corolla due to a CEL. I forget the code number. It is a very simple repair.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles
2004 Rav4 359,000 miles
2015 Camry 59,000 miles
Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: willbur] #4632876
01/12/18 08:36 PM
01/12/18 08:36 PM
Joined: Nov 2011
Posts: 4,857
MTL, CANADA
Rolla07 Offline
Rolla07  Offline
Joined: Nov 2011
Posts: 4,857
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.

Last edited by Rolla07; 01/12/18 08:36 PM.

2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967

Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: willbur] #4632908
01/12/18 08:57 PM
01/12/18 08:57 PM
Joined: Dec 2013
Posts: 2,088
socal
barkingspider Offline
barkingspider  Offline
Joined: Dec 2013
Posts: 2,088
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


06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)
Re: PO133 vs. PO171 Leaking Intake Manifold Gasket [Re: barkingspider] #4633007
01/12/18 10:03 PM
01/12/18 10:03 PM
Joined: Jun 2013
Posts: 298
sw ohio
willbur Offline OP
willbur  Offline OP
Joined: Jun 2013
Posts: 298
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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