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If your 2008 Cadillac CTS is producing a knocking noise from the engine, there are a couple of potential reasons for this issue. A faulty O2 sensor could disrupt the air-to-fuel ratio, leading to either a rich or lean mixture that may result in knocking, reduced acceleration, and higher fuel consumption. A relatively simple fix, replacing the O2 sensor typically costs around $50, so addressing it promptly is advisable. Another common cause of engine knocking is a malfunctioning timing chain, which poses a more serious risk as it could cause significant engine damage. Replacing a timing chain can cost approximately $300, but it is crucial to address this issue immediately.
Typically, a knocking sound in a 2008 Cadillac CTS is often linked to a faulty timing chain. Alternatively, the knocking noise can also occur when there is an incorrect air-fuel ratio, causing the fuel to ignite in small pockets instead of large bursts. If left unaddressed, this issue can lead to harm to the piston and cylinder walls.
How can I repair it without spending too much money?