After a Rebuild I got Codes

Fixitup944 · July 30th, 2011, 10:29 PM

SUBJECT: 1997 v6 3.8L with caramel/coffee shake mix all through the engine.
FIX: I dis-assembled the engine, flushed and cleaned everything re-gasketed everything, re-placed the water pump while I was at it and carefully re-assembled the engine.
RESULTS: Awesome! Engine starts, runs and purrs like a kitten on steroids.
BUT...I have four codes including a P0135, P0136, P0141 and P1131 (I can't find this one in my manuel).

I think that the 135, 136 and the 141 were caused when I disconnected the sensors upstream and downstream of the Catalytic Convertor...Does that sound reasonable??...and what is the liklihood that those codes will clear after sufficient data has be re-stored in the onboard computer?

Any suggestions?? And does anybody know what the P1131 code is??

rfcsoulja · July 30th, 2011, 10:34 PM

Have you tried disconnecting your battery for a little while to clear the codes?

Green_6er · July 30th, 2011, 10:37 PM

Code: P1131
Info: Lack of Upstream Heated Oxygen Sensor Indicates Lean - Bank No. 1

Fixitup944 · July 30th, 2011, 11:09 PM

Originally Posted by Green_6er

Code: P1131
Info: Lack of Upstream Heated Oxygen Sensor Indicates Lean - Bank No. 1

Yeah...Thanks, I found that in a further search...BUT what does it mean...in plain English?

Green_6er · July 30th, 2011, 11:29 PM

O2s r bad or not hooked up.

Fixitup944 · July 31st, 2011, 05:43 AM

COuld the computer have lost all of the stored data and therefore triggered an engine code from simply disconnecting those sensors during my re-build?

mustangmike! · July 31st, 2011, 05:58 AM

doesn't mean O2 are bad actually, could be bad, but no one is saying they are ...
You might be actually running lean on that half of the world ...

Fixitup944 · July 31st, 2011, 07:50 AM

Originally Posted by mustangmike!

doesn't mean O2 are bad actually, could be bad, but no one is saying they are ...
You might be actually running lean on that half of the world ...

I agree with this, especially since I recall replacing one or two of the sensors a while back (within the last two years...real low mileage since then) and when I did the rebuild I also rebuilt the fuel injectors with new o-rings and caps and cleaned em up a bit...

When the code description indicates "Bank 1" what are they referring to? What is Bank 1 vs Bank 2?

Fixitup944 · July 31st, 2011, 09:25 AM

...and hypothetically speaking, IF the upstream O2 sensor was bad at either the electrical connection end of it or the actual sensor part of it could that cause a fault reading at the downstream sensor just because it is in line?

Mr. Red Pony · July 31st, 2011, 12:47 PM

Do buy anything else yet. Just clear the codes and see if any come back.

Loki · July 31st, 2011, 12:55 PM

I have the same P1131 code & haven't been able to get rid of it yet. I tried clearing it, no luck. I changed my tune, no luck. Tried cleaning the fuel system, still nothing. The car's running fine, but that code is bothering the hell out of me. Lol, I'll let you know if I figure out for sure what it is on mine.. There's a load of things it can be, tho =/

Fixitup944 · July 31st, 2011, 09:46 PM

My biggest problem is that it failed the Massachusetts Emission test for its annual inspection because of those codes so now I have a "R"ejected sticker for 60 days until I have to have it repaired and reinspected. So I have 60 days to figure out what I am gonna do.

July 30th, 2011, 10:29 PM	#1
Fixitup944 Newbie Join Date: Dec 2006 Posts: 11 iTrader: 0 reviews	After a Rebuild I got Codes SUBJECT: 1997 v6 3.8L with caramel/coffee shake mix all through the engine. FIX: I dis-assembled the engine, flushed and cleaned everything re-gasketed everything, re-placed the water pump while I was at it and carefully re-assembled the engine. RESULTS: Awesome! Engine starts, runs and purrs like a kitten on steroids. BUT...I have four codes including a P0135, P0136, P0141 and P1131 (I can't find this one in my manuel). I think that the 135, 136 and the 141 were caused when I disconnected the sensors upstream and downstream of the Catalytic Convertor...Does that sound reasonable??...and what is the liklihood that those codes will clear after sufficient data has be re-stored in the onboard computer? Any suggestions?? And does anybody know what the P1131 code is??

July 30th, 2011, 10:34 PM	#2
rfcsoulja Hardcore Enthusiast 01 True Blue v6 to slow to matter Join Date: Mar 2009 Location: Oklahoma Posts: 1,141 iTrader: 0 reviews	Have you tried disconnecting your battery for a little while to clear the codes? __________________ My supercharged v6 http://www.youtube.com/watch?v=1lNkgKBw0bw

July 31st, 2011, 05:58 AM	#7
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	doesn't mean O2 are bad actually, could be bad, but no one is saying they are ... You might be actually running lean on that half of the world ... __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

July 31st, 2011, 12:47 PM	#10
Mr. Red Pony Resident badass 01 Built V6 (3.9) 13.91 @ 99.1 N/A Join Date: Jan 2010 Location: Lawton, Oklahomo Posts: 6,789 iTrader: 10 reviews	Do buy anything else yet. Just clear the codes and see if any come back. __________________ 271rwhp N/A V6 The Name is Danny. I'm a GM Technician. Suck it.

July 31st, 2011, 12:55 PM	#11
Loki Enthusiast 1996 V6 Join Date: Feb 2011 Location: Connecticut Posts: 632 iTrader: 0 reviews	I have the same P1131 code & haven't been able to get rid of it yet. I tried clearing it, no luck. I changed my tune, no luck. Tried cleaning the fuel system, still nothing. The car's running fine, but that code is bothering the hell out of me. Lol, I'll let you know if I figure out for sure what it is on mine.. There's a load of things it can be, tho =/ __________________ 1996 3.8L.. Split Port Swap, CAI, True Dual Exhaust, the car accident mod. Need cheap parts? CLICK MEEEEEEEEE!! =]

July 31st, 2011, 05:43 AM	#6
Fixitup944 Newbie Join Date: Dec 2006 Posts: 11 iTrader: 0 reviews	COuld the computer have lost all of the stored data and therefore triggered an engine code from simply disconnecting those sensors during my re-build?

July 31st, 2011, 09:25 AM	#9
Fixitup944 Newbie Join Date: Dec 2006 Posts: 11 iTrader: 0 reviews	...and hypothetically speaking, IF the upstream O2 sensor was bad at either the electrical connection end of it or the actual sensor part of it could that cause a fault reading at the downstream sensor just because it is in line?

July 31st, 2011, 09:46 PM	#12
Fixitup944 Newbie Join Date: Dec 2006 Posts: 11 iTrader: 0 reviews	My biggest problem is that it failed the Massachusetts Emission test for its annual inspection because of those codes so now I have a "R"ejected sticker for 60 days until I have to have it repaired and reinspected. So I have 60 days to figure out what I am gonna do.

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