P0240 Air Leak before the Heat Oxigen Sensor 2. on Toyota Tacoma

Average mileage: 191,000 (191,000–191,000)
1 model year affected: 1997
1 person reported this problem
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I believe I had this problem reoccurring for the longest time. I had o2 sensors and catalytic converters change but this problem is reoccurring all the time. I had an MAF go bad and had it replaced and this will pop out again. Can someone help me?