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Old 09-17-2013, 11:57 PM   #1
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O2 Sensors

Hey guys when the exhaust shop installed my X Pipe my rear O2 sensor wasn't long enough to connect , so 1 is in plugged ..
I noticed I'm running rich because my tips are always black ..

Can this be hurting my car alot ?
I notice I'm getting low mpg like around 14-16 mixed , thanks
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Old 09-18-2013, 12:25 AM   #2
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No it really doesnt do much of hurting your car. Well the header sensors will for sure make a change since they calibrate fuel/air ratios and the x pipe sensors are just sensors to read. But if there just your x pipe sensors you'll just be wasting more gas no effects to your car. There's O2 extensions you can get so they reach the plug in adequately
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Old 09-18-2013, 12:29 AM   #3
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You don't have cats so I dont think it will hurt your car.
Around here, gas prices have been rising, so that should be reason enough to get that 02 hooked up.
And you have the big race coming up. You have to get that car running right Slow...
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Old 09-18-2013, 12:45 AM   #4
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I just reread this. You said rear? Do you mean the downstream sensor?
If so, that is NOT why your car is running rich. The downstreams only tell the computer whether or not the cats are doing their job. They don't provide engine management information...
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Old 09-18-2013, 01:01 AM   #5
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I just reread this. You said rear? Do you mean the downstream sensor?
If so, that is NOT why your car is running rich. The downstreams only tell the computer whether or not the cats are doing their job. They don't provide engine management information...
+1 It can't be your x pipe sensors like I said. If it is your O2 sensors they must be your header sensors those control fuel and air ratio
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Old 09-18-2013, 01:36 AM   #6
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Quote:
Originally Posted by straybullitt View Post
You don't have cats so I dont think it will hurt your car.
Around here, gas prices have been rising, so that should be reason enough to get that 02 hooked up.
And you have the big race coming up. You have to get that car running right Slow...
Lol amen
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Old 09-18-2013, 08:56 AM   #7
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I have been using O2 blockers with my Bassani off road X-pipe (no cats) an my normal MPG is 20 to 24 city and highway. Same setup on a 17 hour run to south Flordia gave me 27.3 avg mpg.

I dont remember the brand, but I got them from CJ pony parts about 9 years ago.
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Old 09-24-2013, 01:00 PM   #8
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I'm new here but this is my topic also. My downstream sensors are both being read and causing the check engine light to come on. Both codes point to the sensors in bank 1 .I have already recently replaced the upstream. I have cats only. My mechanic said it could be bad sensors or not enough back pressure. The car is running great. Should I replace the sensors or look for a muffler shop? Or any other ideas
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Old 09-24-2013, 04:22 PM   #9
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Originally Posted by Stub32 View Post
I'm new here but this is my topic also. My downstream sensors are both being read and causing the check engine light to come on. Both codes point to the sensors in bank 1 .I have already recently replaced the upstream. I have cats only. My mechanic said it could be bad sensors or not enough back pressure. The car is running great. Should I replace the sensors or look for a muffler shop? Or any other ideas
What year is your car? Have you modified the exhaust?
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Old 09-24-2013, 04:32 PM   #10
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1998 Mustang GT. I just bought the car a month ago so I do not know if the exhaust was modified. I'm assumming it was because there are no mufflers. But I don't know how it came originally. It does have 4 o2 sensors
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Old 09-24-2013, 04:44 PM   #11
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I wanna say it most likely is just your downstream sensors. I have an 02 and my like came up for the sensors about 2 weeks ago and there stock so being an earlier model I'd say to replace them. And even if it happens to be something else having replaced them isn't worthless they are bound to fail soon anyways
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