Eh Eye Ate Dub Yah ✡︎ :ally:<p>I hate <a href="https://mastodon.ai8w.ddns.net/tags/shady" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>shady</span></a> <a href="https://mastodon.ai8w.ddns.net/tags/car" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>car</span></a> <a href="https://mastodon.ai8w.ddns.net/tags/repair" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>repair</span></a> shops.. </p><p>A friend was told she needed to spend $800+ to fix her check engine light.</p><p>I have an OBD-II reader connected to a laptop via USB, so I plugged in and pulled the <a href="https://mastodon.ai8w.ddns.net/tags/codes" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>codes</span></a> - the knock sensor and both O2 sensors tripped AT THE SAME TIME!</p><p>This usually indicates bad fuel, not bad O2 or knock sensors, so I reset the code to test if it was an ongoing issue. It does not seem to be ongoing; the Check Engine light didn't come back on, and no new codes popped. Fixed in 15 minutes for $0.</p><p>If it codes up again, which is a possibility ('08 Saturn Aura) I'll look deeper into the issue, but if both the O2 and Knock sensors were bad, the ECU would've thrown codes back out immediately, or after I revved the engine a few times. </p><p>She made it home (about a 15 minute drive) without a code popping back up, so I'm confident it was just bad/wet gasoline.</p>