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Completely puzzled on air/fuel codes. - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHCompletely puzzled on air/fuel codes. - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Replace over the last year

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What I’ve already replaced over the last year

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Completely puzzled on air/fuel codes. - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Smoke-test through the intake and i couldn’t find any leaks

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I’ve done a smoke test through the intake and I couldn’t find any leaks.

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Completely puzzled on air/fuel codes. - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Replace over the last year

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What I’ve already replaced over the last year

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Completely puzzled on air/fuel codes. - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Smoke-test through the intake and i couldn’t find any leaks

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Suggestion · Original poster

I’ve done a smoke test through the intake and I couldn’t find any leaks.

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Completely puzzled on air/fuel codes. - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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POST 1 / ORIGINAL POSTEROriginal post

98 62k miles What I’ve already replaced over the last year - MAF - AOS - Coolant - Spark Plugs - Oil Filler Tube I get different codes every time the CEL comes on, but today some new codes came up. The current codes I have are: P0430 P0410 P1411 Pending codes: P1129 P1127 I usually have P1124 and P1126. When I remove the oil cap, it runs rough for about 4 seconds, then steady idles at 950 or so. I’ve done a smoke test through the intake and I couldn’t find any leaks. Here are my current CAT readings Bank 2, I’m giving it a bit gas so about 1,750 rpm’s Bank 2, idle Bank 1, 1750 rpm Bank 1 idle

POST 2Original post

Any smoke on startup? Could be AOS replacement time.

POST 3Original post

P0410: Secondary air injection signal implausible, bank #1 P1411: " bank #2 P0430: Main cat conversion too low, bank #2 P1127: Mixture is so rich that the DME cannot compensate, bank #1 P1129: " bank #2

POST 4Original post

You have multiple things going on. P0410 and 1411 are both for the SAI system and not related to the others. I would tackle these separately and try to address these once all the others are resolved. Your O2 sensor signals may suggest that both cats are close to the end of their lifetime, the post-cat signal should not follow the pre-cat signal like that. Post-cat signal should be more or less flat. The O2 signals at idle are confusing though... are you sure the tool was connected? The pre-cat sensor's signal should be oscillatong between 0 and 1, and if not doing that it should throw a separate code for sensor malfunction or signal interruption. I can't see those codes in your list. The mixture richness may be due to a leaking injector or some vacuum leak. I'd clear all codes and see which one comes back and when.

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