Installed Solo Hiflow DP and o2 extender still get p0420 - Pontiac Solstice Forum
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post #1 of 7 (permalink) Old 04-10-2019, 10:40 AM Thread Starter
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Installed Solo Hiflow DP and o2 extender still get p0420

So I installed the Hiflow Cat and the O2 extender that came with the kit, but still got a p0420 code after only 5 miles of driving. Should it still throw the code with the SOLO extender in? Would a 90 degree extender work better?
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post #2 of 7 (permalink) Old 04-10-2019, 02:20 PM
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Should be no codes with the extender. Do your self a favor and call Solo, their support is outstanding.
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post #3 of 7 (permalink) Old 04-11-2019, 08:44 AM
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Did you install the extender in the correct port? There are two, and it only works if you hit the right one.

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post #4 of 7 (permalink) Old 04-11-2019, 08:54 AM Thread Starter
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Yes. It's in the port on the actual exhaust not the downpipe. I did have another extender that has a 90 degree turn in it that I put on and cleared the code again. I guess I'll see if that works instead.
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post #5 of 7 (permalink) Old 04-15-2019, 10:32 AM Thread Starter
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I took out the extender that came with the Solo DP and put on an extender I bought off Amazon that is an l-shape. So far so good. No check engine lights yet!
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post #6 of 7 (permalink) Old 04-25-2019, 06:12 PM
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Originally Posted by MattM View Post
I took out the extender that came with the Solo DP and put on an extender I bought off Amazon that is an l-shape. So far so good. No check engine lights yet!
Link please? I installed the hi flow cat and I get o2 sensor problems (p0133) with the extender, but absolutely no issues (except the expected cat flow code) without it
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post #7 of 7 (permalink) Old 04-30-2019, 10:09 AM Thread Starter
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There are tons on Amazon...All you have to do is search O2 extender but here is a link to one I just went to:

https://www.amazon.com/AP1805P-Oxyge...-1-spons&psc=1
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