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My 1999 escort zx2 is running pretty rough i replaced the o2 sensors about 4 months ago and now its running bad again it smooths out at high rpms and its running leanon ban sensor 2 i scanned it and pulled three codes p1131, p0136, and b1318

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The error p1131 and p0136 may be related. The first error describes the fuel being lean and the second for the 02 sensor. Chances are that this is a problem with the Mass Air Flow sensor usually located at the corner of the air filter. A bad or contaminated MAF sensor would give the ECU a wrong reading of the amount of air which makes air fuel ratio wrong which is then detected by the oxygen sensor. It would be best to use a tuner cleaner for this. You may want to remove the MAF sensor and see if the problem stays. If it goes away then it is a contaminated cleaner. It is either contaminated or may need replacing.

As for the b1318 error, it is related to the supply of current. If you notice that the headlamp increases in intensity when you step on the gas then it may be a weakening battery. It would be best to use a voltmeter tapped across the battery to test the alternator. When the engine is stopped with no electrical on, it should be at 12.5volts above and when you have the engine running it should be 14volts and when headlights are up it should be at 13volts. If the voltage is lower then the alternator may be weak.

Posted on Apr 10, 2011

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