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Wondering if I have a case:
shop charged me $400 to install new knock sensors. Code came back immediately, even at the shop. They thought it was a mysterious electrical, wiring harness issue. what i discovered this weekend was a loose bolt (free turning) holding the front sensor on (the one that was setting the DTC 1-4-3). I torqued it down and the code has not come back.
What is a fair proposal to the shop for this error?
matt
nashville, tn
BTW: Almost all of the instructions for this procedure omitted disconnecting the EGR valve from the bottom of the Intake Manifold (with two 8mm bolts). Apparently Volvo quit using this setup sometime after 1994. It was a major PITA.
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