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<blockquote data-quote="B33mEr" data-source="post: 409558" data-attributes="member: 13609"><p>Since am quite free lol <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" />:</p><p></p><p></p><p>From E46fanatics:</p><p>WHO: People who upgraded to aftermarket headers without installing any catalytic converter will get a catalytic inefficiency error code. Likewise, people who install high-flow catalytic converter will get the same "inefficiency" error codes.</p><p></p><p>WHAT: Catalytic Inefficiency codes on the post cat 0xygen sensor: P0420 (cylinder 1-3) P0422 (cylinder 4-6). </p><p>Ref: <a href="http://www.obd-codes.com/trouble_cod...old-bank-1.php" target="_blank">http://www.obd-codes.com/trouble_cod...old-bank-1.php</a></p><p></p><p>WHY: The reason why your OBD-II diagnostic systems report this error code is because the 02 sensors detect an above normal exhaust reading when compare to OEM catalytic converter. The OEM catalytic converter does an excellent job at filtering/cleaning/converting exhaust fumes into cleaner air. The DME/ECU calibrates its post-cat sensors to the OEM catalytic converter performance and specs. Therefore, aftermarket cats do not clean well enough to satisfy the catalytic efficiency monitoring of the DME. This is a very common problem with aftermarket cats especially the high-flow ones.</p><p>An "inefficiency" reading does not mean that your catalytic converter is broken especially if it is brand new. Again, the error codes just means that they are not performing as efficient enough to meet OEM standards.</p><p></p><p>SOLUTION: There are three feasible options to solve this inefficiency problem</p><p></p><p>Ignore. </p><p>Spark Plug non-fouler (aka Spark Plug defouler) </p><p>Software upgrade </p><p></p><p>-Ignore-Since the post catalytic converter oxygen sensors is purely for emission monitoring it does not in ANY way affect your fuel trim and car performance. Therefore, it is perfectly fine to ignore the check engine light.</p><p>-PRO: No time and resources wasted on fixing problem</p><p>-CON: Annoying check engine light </p><p></p><p><strong>-Software Upgrade-Software upgrade from major tuning companies will flash your DME to remove the "catalytic efficiency" monitoring feature. </strong></p><p><strong>-PRO: Fast and requires no hardware/equipment modification to exhaust systems</strong></p><p><strong>-CON: Expensive</strong></p><p><strong></strong></p><p><strong>-Spark Plug non-fouler (aka Spark Plug defouler)-By installing the spark plug non-fouler, you are in essence moving the rear 02 sensor out of the direct flow of the exhaust stream/flow. By doing so, you are tricking the 02 sensor will an inaccurate reading. Since the 02 sensors is not directly in the path of the exhaust fumes, it can not accurate measure the exhaust fumes.</strong></p><p><strong>-PRO- Inexpensive</strong></p><p><strong>-CON- None</strong></p></blockquote><p></p>
[QUOTE="B33mEr, post: 409558, member: 13609"] Since am quite free lol :D: From E46fanatics: WHO: People who upgraded to aftermarket headers without installing any catalytic converter will get a catalytic inefficiency error code. Likewise, people who install high-flow catalytic converter will get the same "inefficiency" error codes. WHAT: Catalytic Inefficiency codes on the post cat 0xygen sensor: P0420 (cylinder 1-3) P0422 (cylinder 4-6). Ref: [url]http://www.obd-codes.com/trouble_cod...old-bank-1.php[/url] WHY: The reason why your OBD-II diagnostic systems report this error code is because the 02 sensors detect an above normal exhaust reading when compare to OEM catalytic converter. The OEM catalytic converter does an excellent job at filtering/cleaning/converting exhaust fumes into cleaner air. The DME/ECU calibrates its post-cat sensors to the OEM catalytic converter performance and specs. Therefore, aftermarket cats do not clean well enough to satisfy the catalytic efficiency monitoring of the DME. This is a very common problem with aftermarket cats especially the high-flow ones. An "inefficiency" reading does not mean that your catalytic converter is broken especially if it is brand new. Again, the error codes just means that they are not performing as efficient enough to meet OEM standards. SOLUTION: There are three feasible options to solve this inefficiency problem Ignore. Spark Plug non-fouler (aka Spark Plug defouler) Software upgrade -Ignore-Since the post catalytic converter oxygen sensors is purely for emission monitoring it does not in ANY way affect your fuel trim and car performance. Therefore, it is perfectly fine to ignore the check engine light. -PRO: No time and resources wasted on fixing problem -CON: Annoying check engine light [B]-Software Upgrade-Software upgrade from major tuning companies will flash your DME to remove the "catalytic efficiency" monitoring feature. -PRO: Fast and requires no hardware/equipment modification to exhaust systems -CON: Expensive -Spark Plug non-fouler (aka Spark Plug defouler)-By installing the spark plug non-fouler, you are in essence moving the rear 02 sensor out of the direct flow of the exhaust stream/flow. By doing so, you are tricking the 02 sensor will an inaccurate reading. Since the 02 sensors is not directly in the path of the exhaust fumes, it can not accurate measure the exhaust fumes. -PRO- Inexpensive -CON- None[/B] [/QUOTE]
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