i have recently changed my leaking manifold for pacesetter longtube headers. i have no cats and the rear 02 sensors are turned off and tied up. i know when i had my front 02 sensors off i rubbed them with a rag. coukld that be the cause of my p1131.? the front sensors are in the headers and i had to extend them. do i need a tune? will it hurt to drive on it? what do i do? also i recently changed out my entire intake manifold. everything runs good maybe bad mpg but A+. PLEASE HELP

 

Hard to tell w/o looking at your truck, but i recommend checking the basics

1-check/replace Fuel Filter

2-Scan your OB computer and see if it's operating closed loop, in which case ya might have a bad O2 sensor

3-If you accidently rubbed any sort of compound onto the tail end of the O2 sensor, you can definitely affect it's performance and even possibly ruin it via whatever compound interfering with the electrical flow through the Sensor

Hope this helps. Stay dirty and good luck OP

 

Once again, I venture to this site. They didnt have a full description on that code, but they did have the one for P1151. Same exact code, except its for bank 2, not bank 1. Heres the link if you think it could help:

http://www.obd-codes.com/trouble_codes/ford/p1151.php

 

How did you turn the O2 sensors off if you do not have a tune??????

P1131 - Lack of HO2S-11 Switch, Sensor Indicates Lean
A HEGO sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.
See Possible Causes for DTC P1130

P1130 - Lack of HO2S-11 Switch, Fuel Trim at Limit
The HEGO Sensor is monitored for switching. The test fails when the HO2S fails to switch due to circuit or fuel at or exceeding a calibrated limit.
• Electrical:
• Short to VPWR in harness or HO2S
• Water in harness connector
• Open/Shorted HO2S circuit
• Corrosion or poor mating terminals and wiring
• Damaged HO2S
• Damaged PCM
• Fuel System:
• Excessive fuel pressure
• Leaking/contaminated fuel injectors
• Leaking fuel pressure regulator
• Low fuel pressure or running out of fuel
• Vapor recovery system
• Induction System:
• Air leaks after the MAF
• Vacuum Leaks
• PCV system
• Improperly seated engine oil dipstick
• EGR System:
• Leaking gasket
• Stuck EGR valve
• Leaking diaphragm or EVR
• Base Engine:
• Oil overfill
• Cam timing
• Cylinder compression
• Exhaust leaks before or near the
A fuel control HO2S PID switching across 0.45 volt from 0.2 to 0.9 volt indicates a normal switching HO2S

 

We'll I know I rubbed my sensors pretty good with a dirty rag. And yea my SCT tuner can turn them off. But I was wondering if I need a custom tune

 

bump