Hi,
I would appreciate some guidance please. My 06 Accord 4cyl was running great . A buddy was helping me with car maintenance a few mo ago. He ended up taking whole clamp off air duct instead of loosening and dropped/lost it then.... Long story short replacement clamp was loose until got a tight fitting replacement. Also air box screws needed to be replaced which was done recently and battery changed recently.
Right After that noticed car was running rough and at same point on highway when merging and accelerating with a heavier foot than usual, check engine light would engage steady (never blinking) Felt a judder for a sec before went on but after the hiccup rode fine no prob rest of ride... After 3 starts or so light was gone and it would happen againbut light would be gone after a few starts and id forget about it.. .. I have since changed oil and tightened everything to ensure no vacuum leaks ie. new Airbox cleaner screws, tight worm clamp.
I have not been driving it much lately though and so yesterday I went on a long drive and triggered P1009 engine light at abt same amt of high acceleration I have before when CEL came on
Before I start following steps for resovling the CEL code P1009 im wondering if This code could have been triggered by car not relearning idle after messing with Air duct..
Any input is welcome. I will post the freeze frame when CEL triggered from my basic scanner below..
Only I/M readiness code that did not show "OK" was CAT_RDY showing "INC"
DTCFRZF P1009
LOAD_PCT 96.5%
ETC 185˚F
SHRTFT1 -7.0%
LONGFT1 -6.3%
MAP 29.1inHg
RPM 3024/min (noticed car really made me work to reach 3000RPM let alone stay there seeming to prefer just under or over)
VSS 29mph
SPARKADV 14.5˚
IAT 127˚F
MAF 8.3lb/min
TP 52.5%
TP_R 56.1%
Oil was changed 3 weeks ago and still high level (0W-20 full syn)
Change every 5k.. last owner had timing chain replaced at 120k miles and it is now at 161k mi
Today Did fresh restart with idle relearn disconnecting battery cables and let sit for a few min with disconnected) Reconnected and made sure all electronics off , held down gas in park at 3k rpm until fans running and then let idle for several min (RPMs were down to about 800/min when idling
O2 sensor 1 bank 1 was only moving between .05mA to as low as -.03 mA (seems very low is this one supposed to have such low voltage?) O2 sensor 2 bank 1 was fluctuating a fair deal from .1V to .7V
while doing relearn in park car threw P0453 code....cleared CEL code and took car for test drive after relearn was complete and right before hitting 3000rpm CEL ,p1009 activated I reset again and got on highway... 3 min ltr at 3k rpm CEL went on again - P1009... Car is idling better though ...but did not replicate the P0453 code.
Where should I start? Would faulty O2 sensor throw P1009 code?
Thanks!
Ok, you need to find out what the code actually means in order to fix it. Check out the trouble light topic in the FAQ.
There was no disrespect in my response whatsoever. Just truth. Many people who come to the forum looking for help are not mechanically inclined, and are usually looking for guidance, or trying to learn, and so it's not unusual that visitors aren't familiar with vehicle self-diagnostic systems. All you mentioned was a 5-digit code, and you gave no indication that you knew what it meant, or how to go about diagnosing it. I assumed that's where you got stuck so I pointed you to more resources where you could find answers. Where I'm from that's called helping, so I don't know how you could interpret that as disrespect.
Anyway! moving on ... For the benefit of everybody else here trying to help, I'll go look up the entire code...
P1009 - Variable Valve Timing Control Advance Malfunction
I can't think of any good reason why an O2 sensor would cause the VTC to malfunction. You're on a wild good chase with that.
There's a very helpful article about it here: (in the top 3 google search results)
https://www.engine-codes.com/p1009.html
If this were my car, I would go straight to the troubleshooting in that article. I wouldn't waste my time with O2 sensors, fuel trims and idle relearns. The article doesn't doesn't mention anything about O2 sensors either.
Have you checked the VTC stainer for blockage?
Have you checked your timing chain for stretch? Forums also talk about this as the cause. You did not mention you vehicle mileage, which is right in the instructions when posting a question here.
The article also has several helpful step-by-step videos showing you exactly how to check this stuff.
Here's the first Youtube result when I look for "Accord P1009"
https://www.youtube.com/watch?v=ExuOkXi1fjY
Thank you for responding in such depth and I apologize for the frustration. It is likely an accumulation of other frustrations and certainally meant nothing personal. I appreciate you volunteering your time and will be clearer in the future about what my knowledge base is. Thanks for having an adult discussion over the matter and not simply ignoring. I really very much do appreciate it.
Your response is helpful. I doubt and also hope it is not the chain. The last owner had chain replaced at dealer at nearly 120k miles which i verified and it is now at 161k..mi Oil changed regularly every 5k mi.
You said you and your buddy were doing some work (maintenance) and specified intake area - what did you do? Did you by any chance do anything to the MAF sensor? Also, for the P1009 code (link) MMJ provided, you can probably rule out 2 of the causes (engine oil level and dirty engine oil, since you just changed your oil and at correct level) Before going on a wild goose chase looking at the VVT and timing chain (which can throw P1009) check the link below and also double check your battery posts and clamps, make sure they are clean and are properly connected and tightened (let’s rule something as simple as that out) - not loose.
See below:
Also, your O2 sensor data don’t make sense: O2 sensor 1 is your air/fuel ratio sensor (located after your engine and before your catalytic converter, also called upstream sensor). It should fluctuate between 0.1 and 0.9 V. Your sensor 2 is located after the catalytic converter (also called downstream) and should remain steady (around 0.5V). A malfunction here should not cause P1009 code - or at least I don’t see how it should.
See below for crash course on O2 sensors:
https://m.youtube.com/watch?v=DvKZ2GDYEz4&list=PLaRuYYPxjXI2phrxwaDfgykxs3UvigUAg&index=16
The information from the air/fuel ratio sensor (aka O2 Sensor 1) is merely used to add or subtract fuel. Worst case it malfunctions then your engine will run too lean or too rich (waste fuel). It is not tied to the VVT system - that’s a separate issue.
thanks. I know possible culprits.. I posted more background info to get help in with ruling out other possible causes before I delve into the Several reasons for it triggering.. specifically wondering if a faulty O2 sensor could be responsible.. If advising me to look up what the code means is the solution then that is much less expertise than what I thought the purpose of this forum was for.
So... you don't want to share or address what the actual diagnostics are showing... and you want to look at everything BUT the possible causes for your problem. You expected us to just go along with this line of reasoning.. and you think I don't have expertise because I would do the most obvious and most logical thing first. You have no idea what to do, so you come here to put down the people you're asking help from.
Boy! Well isn't that some 4D chess right there!
Best of luck to ya.
I was simply hoping for a more respectful response than a cookie cutter answer of "look at what the code means" I provided info and asked about other possible causes? That is actually smart reasoning to inquire if something like an O2 sensor or other abnormal data is throwing the code so I wont waste my time with bigger projects. I assure you I am not looking for every other reason but I guess that is your interpretation of what I am doing.. If you felt i put you down I am sorry for that. I researched the code prior to asking the question here and hoped for more insight. I was frustrated by your response and again had hoped for a response that acknowledged my question was more than "what does P1009 mean" But alas, I am not here to argue.. You responded so I will continue to reference the code as advised. Thank you for trying be helpful. No 4D chess to be played.