bwhitsonjr

So I went out and bought a cheap scan tool so I could figure out what was causing the VSC off light, the Check Engine light, and the slip indicator light I believe it to be. So in scanning the vehicle I found 4 codes .

Code 1: P0304 - Cylinder 4 misfire detected

Code 2: P0352 - Ignition coil B Primary/Secondary Circuit

Code 3: P0354 - Ignition coil D Primary/Secondary Circuit

Code 4: p0352 - ignition coil B Primary/Secondary Circuit

Not sure why the first code repeated itself. I thought that once it was recorded that, that was store and not reported again.

Any and all help is appreciated! I don't know what to do about the misfires. I'm thinking it's more of a coil replacement solution and might as well as replaced the plugs while I"m there.

08 RX350 with 199k on the odometer.

I consider myself to be a hands on, problem solver when it comes to replacing parts, but misfires can be a lot of things. I will want to do this work myself as I don't think it takes an ASE certified mechanic to do so... Plus I've got you guys! Thanks for your time!

Nad1370

Those are ignition coil codes and a misfire at #4
Usually its just one coil that goes out.
You have cyl 2 and 4 at the same time.
Luckily it the "easy" bank.
Is it misfiring now?
Most likely its a failed coil that just needs replacing.

bwhitsonjr

Thanks for the reply Nad1370. It is an intermittent misfire. When I drove it to my wife's job and back I noticed it did it to me one time. I felt the engine hesitate when puling away from the stop sign and when I gave a little more gas it smoothed out and didn't happen again. Sat in the driveway when I got home and let it run a bit, idled fine.

Forgot to mention when I pulled the codes and reset them they came back on the very next day she said. So it's a daily occurrence.

Question. What did you mean when you said it was the "easy bank"? I'm guessing you mean the front cylinders? Is there a diagram that shows the firing order or how the cylinders are numbered? Also any meaning of the letter of the coil? Like it listed coil B and D.

Thanks!

Nad1370

If its intermittent, then its safe to say the coil is the culprit.
Easy bank is Bank 2 (radiator side) which has the even cylinders 2-4-6 in that order starting from the left when you open the hood.
You can try swapping coils 4 and 6 and see if the misfire moves to #6.
Then that for sure will tell you if its the coil indeed.

To be honest. i dont know what "B" and "D" is. lol
Could be just internal circuitry identification of the coil itself.

bwhitsonjr

Great idea I think I might try that! Sounds like a good way to narrow down. I will report back my findings!

I know what you mean on the B and D lol

Koolaid54

with a water sprayer you can just take off the cover and spray the coils with water. 95% of the time you can see an arc or it could just start miss firing.

VladCZ

Just in case anyone get this issue: I had couple times the VSC off and Check Engine light coming on. On first occurrence, I took it at the local shop, they ran the code, said it's showing Coolant Temperature Sensor and something else. They reset the computer, told me come back when it comes up again. nothing happened for a year. Then year later, same thing. No misfiring, no problems with a ride. So I took it to a guy who is Honda & Toyota veteran. He ran the codes, thought for a while, and said it's thermostat. Replaced it and looks like that's what it was. The thermostat was actually stuck open - that's why I noticed temperature gauge going slightly down when cruising lightly on the hwy. Now the temperature is steady, heater doesn't oscillate, and so far no codes.

bwhitsonjr

I'm a little confused to say the least...

Upon switching the coil from #4 cylinder to #6 cylinder and vice versa the code hasn't come back for the #4 misfire, or the Ignition coil D Primary/Secondary Circuit. However.... the one code that has tripped again is the P0352 - ignition coil B Primary/Secondary Circuit.

Of all the reading I've done one bad coil can create a multitude of codes.

You tell me???

Nad1370

DennisMik

Tell me about multitude of codes. My car popped the check engine light and when I connected the code reader, I was shocked at the codes that showed.

P0300 P0301 P0302 P0303 P0304 P0305 P0306
C0215 C1201 C01223
U0073 U0123 U0124 U0125

I thought it was time to dig a hole and bury the car! The problem was - (drumroll please) - a bad ignition coil on cylinder # 5.

Can anyone explain this?

Nad1370

No clue and i dont want to guess. lol
Do you still have the freeze frame from the misfire codes?
Were they all hard codes, pending, stored?
Was the engine actually misfiring?

DennisMik

Yes, the engine was misfiring under load, i.e., acceleration, driving over 80 mph, although it didn't feel like a misfire, it was more like a wheel out of balance.

I don't have the freeze frame because I was using an auto parts store reader. I only wrote the codes down on paper.

Nad1370

Makes sense.
At that speed under load, ECM see's the misfire and throttles the injection duration.
Kinda like a mild fuel cut hence it affected all cylinders.
Once the misfire cleared, normal duration sets in.

^^^
Talking out of my a@@ here but its sounds believable. lol