S2000 Under The Hood S2000 Technical and Mechanical discussions.

Two codes P0172 & P0170

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Old Mar 5, 2021 | 08:28 AM
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brandon.s2k's Avatar
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Default Two codes P0172 & P0170

So in the last week i decided to replace a few things i had codes for which was O2 sensor (downstream) and knock sensor. I also replaced my spark plugs and PVC valve as it had a crack in it. My CEL went away for a day but came back up the next day. The codes were P0172 & P0170. I'm not sure if the o2 sensor was bad or maybe an issue the map sensor as I'm also having idle problems where the rpms are low and sometimes completely stall at a stop. I'm not sure if these codes could be related but just wanted to see if anyone has had similar issues or codes and what i could do to figure out what the problem is before i order any new parts.
2002 Ap1
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Old Mar 6, 2021 | 09:36 AM
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Originally Posted by brandon.s2k
So in the last week i decided to replace a few things i had codes for which was O2 sensor (downstream) and knock sensor. I also replaced my spark plugs and PVC valve as it had a crack in it. My CEL went away for a day but came back up the next day. The codes were P0172 & P0170. I'm not sure if the o2 sensor was bad or maybe an issue the map sensor as I'm also having idle problems where the rpms are low and sometimes completely stall at a stop. I'm not sure if these codes could be related but just wanted to see if anyone has had similar issues or codes and what i could do to figure out what the problem is before i order any new parts.
2002 Ap1
That's a fuel delivery issue. Not sensor issue. Car is running pig rich. If IACV cleaning doesn't help idle, it could be the fuel pressure regulator.
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Old Mar 8, 2021 | 11:27 AM
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So the cel ended up going away and the idle seems to be okay right now but i will still clean out the IACV as im sure it still needs to be cleaned and I'll look more into the fuel pressure regulator.
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