P0300 code toyota highlander. Post by hummer3t » Sun Apr 10, 2022 4:39 pm 2013 QX56 with 145000 miles. Started the car and noticed the exhaust tone was lower than usual and the idle was rough. Check engine light came on and went to local auto parts and code p0300 May 10, 2018 · Re: P0524, P0011, P0300 Codes Post by chesbayQX56 » Tue May 15, 2018 12:18 pm VVT ( Variable Valve Timing Control Solenoid- Bank 1 / Driver Side replaced) Tech said it was sticking open and not closing. This has been the culprit all along, I think, causing erratic O2 readings in Bank 2 and triggering pending P0300 and P0174 lean condition. However, the code P0300 displays as "random/multiple cylinder misfire detected" which means its more than one. Plugs were changed several months ago, and vehicle has been running excellent, up until last week when vehicle ran rough all of a sudden. Apr 19, 2020 · Re: P219A code Post by VStar650CL » Sat Sep 30, 2023 5:22 am P0300 is a multiple-cylinder misfire. That's always serious, because unburned fuel can overheat and kill your catalysts. Apr 23, 2021 · They diagnosed "DTC for P0011 P0021 INT/V BANK 1 and 2 as well as P0300" and "found high pressure fuel pump lift valve damage due to high pressure fuel pump not working properly". The symptoms are just like I've experienced on outboard motors when I've had a coil go bad--intermittant misfire and then within a few days it gets worse to where it totally fails. Bad grounding heats up the N-channel transistors inside COP coils and causes "warts" and eventual failures. Jul 20, 2014 · P0300 random cylinder misfire code with no symptoms? Post by Brian35XR » Thu Nov 21, 2024 2:31 pm Anyone ever deal with a P0300 code that keeps popping up after being cleared? The code is for "Random/multiple Cylinder Misfire Detected". . Nov 2, 2021 · P0300- diagnostic code indicates a random or multiple misfire. Oct 29, 2021 · Re: P0300 Random Multiple misfire Post by VStar650CL » Mon Nov 01, 2021 9:41 am If one coil was bad for sure, then the first thing you should do is a voltage-drop test on your block ground and the individual coil grounds. Aug 19, 2010 · Cam shaft timing issue code P0014, P0300 Post by Pimperish1 » Sun Apr 30, 2017 7:47 pm So this happened, kinda detailed cause I did a search and these codes don't appear in the forum. Got on the highway and while it still sounded rough it seemed to drive May 29, 2022 · Strvinmarv Re: QX56 P0300 multiple misfire… God Help me… Post Mon May 30, 2022 7:29 pm Jul 9, 2021 · Re: Lean Bank2 SHRTFT 25% and P0300 random misfire at idle Post by frankdrogotto » Sun Feb 13, 2022 4:24 pm Eurica - A bad harness connector causing the Bank 2 Air/Fuel sensor to give illogical readings. I'd take a hard look at your bank1 coils and plugs before anything else. xfm wewjeyx aqvsvy vkf hluvpfkt ynmju qpsf zpbciz qckt mhej