Downstream O2 sensor mystery? - Ford Mustang Forum
 
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post #1 of 4 (permalink) Old 07-23-2010 Thread Starter
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Downstream O2 sensor mystery?

Ever since I fitted the Magnflow catted X-pipe the CEL has been on, Im getting code P1131, lean on bank #1, Ive read everywhere that I need MIL eliminators on the downstream sensors, the thing is I dont have downstream sensors, the car has never had them, at the moment I have swapped the sensors from left to right and am waiting for the CEL to light again, hoping it will show on the other bank, Am I the only 1 with no downstream sensors, all the SN95's in the UK have them. Any ideas?


96 Mustang GT (Jap Spec) 4.6L v8, Steeda CAI, MSD leads, Blaster coils, Chrome strut brace,17" Rocket Booster Alloys, Eibach Springs & wheel spacers, Monroe Sensatrac Shocks, Magnapack exhaust, Smoked rear lights, UK headlights, Alpine touch screen DVD, Mach 460 sounds, Eibach f & r anti roll bars, Jap wheel arch trims, Opal Frost paint, EBC brakes, full leather, Custom decals, Mach 1 chin spoiler, all chrome switchgear..........More to come
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post #2 of 4 (permalink) Old 07-26-2010
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The rear O2 sensors are only for monitoring the efficiency of the convertors.

P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1.

You could have an exhaust leak, vacuum leak or a fuel injector issue on that bank.

Since the issue showed up after the installation of the X pipe. I would go over all components that were removed or touched during the installation. It could be as simple as a loose connection or fitting or a damaged O2 sensor or wire.

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post #3 of 4 (permalink) Old 07-26-2010 Thread Starter
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After swapping the sensors the CEL came back with the opposite fault code P1151, just ordered new O2 sensors

96 Mustang GT (Jap Spec) 4.6L v8, Steeda CAI, MSD leads, Blaster coils, Chrome strut brace,17" Rocket Booster Alloys, Eibach Springs & wheel spacers, Monroe Sensatrac Shocks, Magnapack exhaust, Smoked rear lights, UK headlights, Alpine touch screen DVD, Mach 460 sounds, Eibach f & r anti roll bars, Jap wheel arch trims, Opal Frost paint, EBC brakes, full leather, Custom decals, Mach 1 chin spoiler, all chrome switchgear..........More to come
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post #4 of 4 (permalink) Old 07-27-2010
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Quote:
Originally Posted by UKStangGT View Post
After swapping the sensors the CEL came back with the opposite fault code P1151, just ordered new O2 sensors
Sounds like you are on the right path...
This file might help you later on...
Attached Files
File Type: txt obdII_codes full text.txt (210.7 KB, 68 views)
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