Throwing codes P0151 and P1153

**01ws6er** · 08-09-2008, 07:49 PM

To start off, I have LT headers and just got the PCM tuned without checking these 1st...

Trying to get my car OBDII emissions ready, and throwing 2 codes; P0151 (Bank 2, upstream sensor) low input voltage. Possible causes... 1) sensor bad. 2)running rich or lean-check other codes 1st (also have P1153). 3)Misfire. 4) Fuel pressure high or low fuel pump/pressure reg.

I'm pretty sure the sensor is bad but I'm wondering if I can get rid of P1153, that it will go away...???

And P1153 insuffecient switching (H02S-21) Switch ratio from rich to lean and lean to rich is below determined # Probable causes... 1)failed (H02S-21) heater circuit...???? 2) H02S1-21 signal shorted ECM ground...???? and 3) Improper oxygen supply to sensor- check sensor connector and wires.

Ok...I did not buy extensions for the front 02's, and just ghetto wired the 4 wires with 24" extensions and spliced them together

But, I also have an exhaust leak (gasket blew out between header flange and head), so could this be causing excess oxygen to get in?

**sunsetorangess** · 08-10-2008, 05:24 AM

Its hard to determine the actual cause until you get that gasket replaced. I would start with replacing the gasket and resetting the codes to see if it comes back, if it does i would replace the up stream 02's. Mine were running "lazy" after about 30 miles and my lt instail. Found out the cermaic flaking off clogged my 02's.
To be honest if you used the extensions i would look into picked up some "pre made" extensions. The splice your own are garbage in my opinion.
J

**01ws6er** · 08-10-2008, 06:08 PM

Originally Posted by sunsetorangess

Its hard to determine the actual cause until you get that gasket replaced. I would start with replacing the gasket and resetting the codes to see if it comes back, if it does i would replace the up stream 02's. Mine were running "lazy" after about 30 miles and my lt instail. Found out the cermaic flaking off clogged my 02's.
To be honest if you used the extensions i would look into picked up some "pre made" extensions. The splice your own are garbage in my opinion.
J

I figured my 02's were bad anyway, that's why I used the ghetto splice method for now, but can corvette 02's be used instead of extensions...? I've heard the harness is longer, but just wanted to make sure they were the same 4 pin connector?

Thanks for your help!

**sunsetorangess** · 08-11-2008, 08:29 AM

Yes the vette extensions can be used and people say they actualy hold up better than our stock sensors.
Run a search and you should be able to dig up the actual part number, i know there bosche.
J

**01ws6er** · 08-11-2008, 06:33 PM

Originally Posted by sunsetorangess

Yes the vette extensions can be used and people say they actualy hold up better than our stock sensors.
Run a search and you should be able to dig up the actual part number, i know there bosche.
J

Why, thank you!

**0rion** · 08-12-2008, 01:08 PM

bosch 13111's are the vette rears. I put those on this summer and no extensions needed.

**0rion** · 08-12-2008, 01:09 PM

Originally Posted by sunsetorangess

Its hard to determine the actual cause until you get that gasket replaced. I would start with replacing the gasket and resetting the codes to see if it comes back, if it does i would replace the up stream 02's. Mine were running "lazy" after about 30 miles and my lt instail. Found out the cermaic flaking off clogged my 02's.
To be honest if you used the extensions i would look into picked up some "pre made" extensions. The splice your own are garbage in my opinion.
J

pacesetters aren't coated on the inside....did you send them to jethot and have them coated inside and out or something?

**01ws6er** · 08-12-2008, 05:27 PM

Originally Posted by 0rion

pacesetters aren't coated on the inside....did you send them to jethot and have them coated inside and out or something?

I know that question wasn't directed toward me, but I have stainless Lt's, so I don't think they are clogged, just overwhelmed by the rich a/f mixture.

**sunsetorangess** · 08-13-2008, 08:31 AM

Originally Posted by 0rion

pacesetters aren't coated on the inside....did you send them to jethot and have them coated inside and out or something?

Its not so much that they are "coated" on the inside, but more like Garbage and debris gets into the tubes and burns off on the intial heat up and cool down deal. Tends to foul out 02's.
J