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Message: <blockquote data-quote="Petrus" data-source="post: 628162" data-attributes="member: 22206">Just to add as sharing, I had the same problem too where my scanner showed 'O2 Sensor controller mixture too rich' on my E46 M54 Engine. In addition to this, I had some misfiring in certain cylinders. Mech initially thought it was the ignition coil. So, I ended up changing one coil and the O2 sensors (part as my preventive maintenance also). But still the error still there. Then got Check Engine Light and scan showed Camshaft Position Sensor. So, went to get 2nd opinion from another mechanic. The other mechanic told me he can 100% guarantee me it is the CCV just from hearing the sound of air leak in the engine. So, I ended up changing the CCV and the hoses, BUT did not change item 5 though. After changing it, no more Cold Start in the morning, and I feel the engine oso more responsive !!! Heheh...So, moral of the story (for me lah) : Learn the error code properly first. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" />Oh, btw bro, I think you can DIY lah. I saw my mech changed this. It is not hard <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> All the best.</blockquote>

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