Hello and welcome. My name is ***** ***** you for visiting the site.
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As you may know, a misfire can be caused by many different things. Spark plug, wire, coil, etc. and the P1135 code is most likely the front heated 02 sensor, (but could be the wiring) and the tests would have to be done to be sure.
Basic tune up with plugs and wires should run about $150 or so and the 02 sensor is around $125 after market. Factory price of $187 and the labor is 0.7 hours.
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