On the 2004 Saturn Vue with the 3.5L engine, the P0325 is pointing to a problem with the Knock Sensor for Bank 1. The Knock Sensor plays a role in the optimal timing of the engine. If the spark plug ignites the compressed air/fuel mixture too late, not all of the air/fuel mixture has time to burn while the fuel is highly compressed. Late ignition causes a decrease in fuel efficiency, decreased power, and increased exhaust emissions. If the spark plug fires too soon, too much of the air/fuel mixture starts burning before the piston reaches the top of the compression stroke. Early ignition of the air/fuel mixture causes detonation, commonly referred to as spark knock. Constant spark knock in the motor is undesirable. Excessive spark knock can reduce engine performance. If severe enough, detonation can cause engine damage. it’s definitely something you do not want to keep driving with for long periods. It “is” safe to drive however. Just under certain conditions, you may hear engine noises, like “pinging” and/or a decrease in fuel economy. Over time, this will cause more problems. Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. If the visual inspection checks ok, replace the Knock Sensor. The Knock Sensor sells for around $46 and the Labor Time Guide calls for 3.5 hours to complete the job. Considering this is a fairly in-depth job, it is highly recommended that both Knock Sensors be replaced at this time.
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