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THE SENSORS ON THE 02 TACOMA 4X4 3.4L ENGINE ARE LOCATED ON THE FRONT AND REAR OF THE EXHAUST SYSTEMS CATALYTIC CONVERTER. THE FRONT SENSOR NEAREST THE ENGINE, IS THE MOST EXPENSIVE .THIS SENSOR ADJUSTS THE AIR AND FUEL RATIO AND PRODUCES A CHECK ENGINE LIGHT WITH A OBDII CODE - P1135 THE Toyota PART NO.89467-35050 OR THE BOSCH #13613 COST AROUND $200.00 THE FRONT SENSOR IS HELD ON BY TWO 12MM STAINLESS STEEL HEX NUTS.THE BEST WAY TO ACCESS THE SENSOR FOR REMOVAL IS TO TAKE OFF THE FRONT WHEEL (PASSENGERS SIDE)AND REMOVE THE FOUR PLASTIC RIVITS HOLDING ON THE ENGINE MUD GUARD. BE SURE TO PRAY FIRST AND THEN SPRAY THE NUTS WITH PB BLASTER A DAY OR TWO BEFORE STARTING. ADVANCED AUTO WILL ALLOW U TO USE THE OBDII CODE READER WHICH IS PLUGGED INTO THE COMPUTER CONNECTOR UNDER THE DASH. BEFORE REMOVING THE SENSOR UNDO THE NEG - BATTERY TERMINAL . WHEN INSTALLING THE NEW SENSOR USE A LITTLE ANTI SCEEZE ON THE STUDS AND USE STAINLESS NUTS TO AVOID RUSTING. AFTER INSTALLATION 20 MINUTES,RETURN TO ADVANCE AUTO AND CHECK FOR ANY CODES. THE SENSORS ON THE 02 TACOMA 4X4 3.4L ENGINE ARE LOCATED ON THE FRONT AND REAR OF THE EXHAUST SYSTEMS CATALYTIC CONVERTER. THE FRONT SENSOR NEAREST THE ENGINE, IS THE MOST EXPENSIVE .THIS SENSOR ADJUSTS THE AIR AND FUEL RATIO AND PRODUCES A CHECK ENGINE LIGHT WITH A OBDII CODE - P1135 THE TOYOTA PART NO.89467-35050 OR THE BOSCH #13613 COST AROUND $200.00 THE FRONT SENSOR IS HELD ON BY TWO 12MM STAINLESS STEEL HEX NUTS.THE BEST WAY TO ACCESS THE SENSOR FOR REMOVAL IS TO TAKE OFF THE FRONT WHEEL (PASSENGERS SIDE)AND REMOVE THE FOUR PLASTIC RIVITS HOLDING ON THE ENGINE MUD GUARD. BE SURE TO PRAY FIRST AND THEN SPRAY THE NUTS WITH PB BLASTER A DAY OR TWO BEFORE STARTING. ADVANCED AUTO WILL ALLOW U TO USE THE OBDII CODE READER WHICH IS PLUGGED INTO THE COMPUTER CONNECTOR UNDER THE DASH. BEFORE REMOVING THE SENSOR UNDO THE NEG - BATTERY TERMINAL . WHEN INSTALLING THE NEW SENSOR USE A LITTLE ANTI SCEEZE ON THE STUDS AND USE STAINLESS NUTS TO AVOID RUSTING. AFTER INSTALLATION 20 MINUTES,RETURN TO ADVANCE AUTO AND CHECK FOR ANY CODES.
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