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Old 05-01-2011, 01:36 AM   #1
cisurfer
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Default more o2 sensor codes ugh

I used to always throw 1131 and 1151 codes until i got my tune from bama because of my longtubes, this past week i put my new trans in from hanlon motorsports and my front suspension (switch to upr)...today i threw 0133 and 0153, o2 slow response, i had the battery disconnected for 4 days while doing this work to it, today i unplugged the o2s and cleaned them off and plugged them back in...tonight i threw 0153, what is going on here, no wires are crimped or exposed sensors are less than a year old. the only different thing i have done is put my catted midpipe back on and to remove the trans i had to remove the passenger side header which i install tight, but the 0153 is the drivers side, any input? should i load my tune again?
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Old 05-01-2011, 06:27 AM   #2
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No need to reload the tune because it donesn't just fall off the computer so to speak. Have you tried replacing the o2s at all?
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Old 05-01-2011, 07:17 AM   #3
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they are both about 5 months old, for both to throw codes at the same time i highly doubt they are bad and are actually doing their job detecting an actually problem, what causes this to happen?
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2002 Mustang GT - Full intake (TB/plenum/cai), Full exhaust (LT headers/mid/catback), frpp 373s/31 spline, UPR tubular front end, stange 10 ways, upr coil overs, black interior swap, frpp alum. driveshaft, UDP, rear lower control arms, full length subframes, UPR torque boxes and more
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Old 05-03-2011, 11:26 AM   #4
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I swapped the o2 sensors from left to right. Cleared codes. P0153 came back. Only thing I did was replace transmission and added my catted midpipe instead of my offroad h
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Old 05-03-2011, 05:19 PM   #5
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Exhaust leak(s) near the O2 sensor can cause those codes...
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Old 05-04-2011, 12:16 AM   #6
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What about exhaust leaks like 2 inches after the sensor at the collector?
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Old 05-04-2011, 01:12 AM   #7
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would having a tune for LT headers and o/r mid cause this to happen when putting a catted mid on?
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Old 05-04-2011, 05:03 AM   #8
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Quote:
Originally Posted by cisurfer View Post
What about exhaust leaks like 2 inches after the sensor at the collector?
I think that falls neatly into the "Exhaust leak(s) near the O2 sensor..." category.

Quote:
would having a tune for LT headers and o/r mid cause this to happen when putting a catted mid on?
It could, however the exhaust leak needs to be fixed first.

The exhaust flow is not one homogeneous stream, but rather a series of pulses created by each exhaust event. These pulses have a head, body, and tail; each with different characteristic, with their pressure relative to the outside world being the most significant.
  • The head is at a pressure higher than ambient, when it passes the "leak" the gas flows out into the world; but the chemical composition of the gas in the pipe remains unchanged;
  • The body is at or close to ambient pressure. When it passes the leak nothing happens as it and the ambient pressure are nearly the same--the chemical make-up of the gas in the pipe remains unchanged;
  • The tail is at less than ambient pressure (nearly a complete vacuum), and when it passes by the leak it sucks in ambient air--changing the exhaust gas chemical composition and making it appear "leaner" to the O2 sensor;

This is why the leak makes the PCM believe the mix is lean, a big or close enough leak can cause the sensor response to slow or even appear "stuck".
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Old 05-04-2011, 11:37 AM   #9
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ok there was a leak, which i fixed, ill try it again though, but like i said the only thing i did was change mid pipes really
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Old 05-05-2011, 12:37 AM   #10
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i pulled the code again tonight, with new o2 sensors and got a p0133, if i have an exhaust leak how does it switch from side to side, one time its 0133 then the next its 0153
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2002 Mustang GT - Full intake (TB/plenum/cai), Full exhaust (LT headers/mid/catback), frpp 373s/31 spline, UPR tubular front end, stange 10 ways, upr coil overs, black interior swap, frpp alum. driveshaft, UDP, rear lower control arms, full length subframes, UPR torque boxes and more
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Old 05-05-2011, 12:37 AM
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