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Yes it is just a sensor, but it does effect how the engine runs. Don’t want to repeat what’s already been said but these direct injection engines (N43 and N53) run a leaner fuel/air mix which results in NOx in the exhaust. If the sensor detects NOx after the NOx cat, it assumes the NOx cat isn’t performing (which it often isn’t) and it will result in the engine running a richer mix, meaning more fuel used and sometimes rougher ruining.
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