2010 BMW 535i.

Engine, bumpy/irregular/misfiring.

Has P300, 301, 303, 304, 305.

Replaced all spark plugs and ignition coils.

Engine runs SMOOOOTH now.

However, still receiving error codes.

using an Innova 6100P for error codes.

I have tried to erase codes, but don't trust that I'm doing that correctly.

Codes say Stored/Confirmed.

Am I missing something simple, like not properly resetting the error codes on the vehicle. Any way to clear the codes on the car without using the Innova tool? Any other advice?

I think that was it- thanks!

Athanasius said:

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2010 BMW 535i.

Engine, bumpy/irregular/misfiring.

Has P300, 301, 303, 304, 305.

Replaced all spark plugs and ignition coils.

Engine runs SMOOOOTH now.

However, still receiving error codes.

using an Innova 6100P for error codes.

I have tried to erase codes, but don't trust that I'm doing that correctly.

Codes say Stored/Confirmed.

Am I missing something simple, like not properly resetting the error codes on the vehicle. Any way to clear the codes on the car without using the Innova tool? Any other advice?

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You need to fix the misfire. Until you do that, the codes will keep coming back. If you get a BMW specific scanner it should have OEM codes not just generic OBD2. Those typically have more info.

When's the last time you changed plugs and coils? They're generally considered 60k mile wear items on turbo BMWs

Yep, you need a BMW specific scanner or app for future troubleshooting. ProTool is a pretty good one for Android.

akaggie05 said:

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Yep, you need a BMW specific scanner or app for future troubleshooting. ProTool is a pretty good one for Android.

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Be careful with Protool - you can screw things up if you don't know what you're doing in the coding sections.

txyaloo said:

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Athanasius said:

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2010 BMW 535i.

Engine, bumpy/irregular/misfiring.

Has P300, 301, 303, 304, 305.

Replaced all spark plugs and ignition coils.

Engine runs SMOOOOTH now.

However, still receiving error codes.

using an Innova 6100P for error codes.

I have tried to erase codes, but don't trust that I'm doing that correctly.

Codes say Stored/Confirmed.

Am I missing something simple, like not properly resetting the error codes on the vehicle. Any way to clear the codes on the car without using the Innova tool? Any other advice?

---

You need to fix the misfire. Until you do that, the codes will keep coming back. If you get a BMW specific scanner it should have OEM codes not just generic OBD2. Those typically have more info.

When's the last time you changed plugs and coils? They're generally considered 60k mile wear items on turbo BMWs

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You effect what is believed to be the fix... clear the codes. If the codes return... back to the drawing board eliminating as the culprit the previous fix. Off the shelf scanner is fine. BMW scanner is overkill, unless constantly your car is ****ing up, or you like tooling on the car.

Plugs I would change. Coils? I'd first inspect for cracks... then replace. However, as a preemptive measure I would replace. OP doesn't reveal what is the mileage on the car. That might be a help.

I've been "fixing", then clearing codes on the Mercedes, BMW, and Porsche vehicles I've owned over the years. OBD and OBD2 readers have worked well. I carry an Acton OBD2 reader in my 986... and have used it on other vehicles I've owned. I tool around on my cars... and am proficient at chasing down the cause(s) of the codes. It pays $150 an hour.

Coils are not necessarily considered a wear item, like spark plugs... in spite of what BMW says/recommends.

JamesPShelley said:

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txyaloo said:

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Athanasius said:

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2010 BMW 535i.

Engine, bumpy/irregular/misfiring.

Has P300, 301, 303, 304, 305.

Replaced all spark plugs and ignition coils.

Engine runs SMOOOOTH now.

However, still receiving error codes.

using an Innova 6100P for error codes.

I have tried to erase codes, but don't trust that I'm doing that correctly.

Codes say Stored/Confirmed.

Am I missing something simple, like not properly resetting the error codes on the vehicle. Any way to clear the codes on the car without using the Innova tool? Any other advice?

---

You need to fix the misfire. Until you do that, the codes will keep coming back. If you get a BMW specific scanner it should have OEM codes not just generic OBD2. Those typically have more info.

When's the last time you changed plugs and coils? They're generally considered 60k mile wear items on turbo BMWs

---

You effect what is believed to be the fix... clear the codes. If the codes return... back to the drawing board eliminating as the culprit the previous fix. Off the shelf scanner is fine. BMW scanner is overkill, unless constantly your car is ****ing up, or you like tooling on the car.

Plugs I would change. Coils? I'd first inspect for cracks... then replace. However, as a preemptive measure I would replace. OP doesn't reveal what is the mileage on the car. That might be a help.

I've been "fixing", then clearing codes on the Mercedes, BMW, and Porsche vehicles I've owned over the years. OBD and OBD2 readers have worked well. I carry an Acton OBD2 reader in my 986... and have used it on other vehicles I've owned. I tool around on my cars... and am proficient at chasing down the cause(s) of the codes. It pays $150 an hour.

Coils are not necessarily considered a wear item, like spark plugs... in spite of what BMW says/recommends.

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He stated he cleared the codes and the error came back immediately. That means it's a current misfire condition the DME is detecting. A cheap BMW scanner will be able to pull the B, C, and U codes from the other modules that he can't see. t's a 15yr old BMW. I guarantee there are codes in other modules he can't see with a generic OBD2 reader.

Coils are 100% a wear item on turbo BMW AND Porsche. Your 986 is 25 years old and not turbo. Your experience with wear components from an NA engine doesn't really apply to a turbo engine.

I missed the OP recently replaced all coils/plugs. My guess is OP used parts from Amazon or the parts store and got bad coils. Non-OE coils will cause issues in a turbo BMW. The factory OEM Delphi coils are the best/only option for that car

To circle back around here:

The vehicle is turbo. 150k miles. Not well maintained by previous owner.

I replace the ignition coils and the spark plugs. Poster was probably right that I most likely didn't have to replace all of the coils, but a gearhead friend who is into BMWs recommended it. A couple were looking gnarly. The plugs were def bad.

I went to same friend who has a really expensive error code computer thing and he cleared all codes. After doing that, the errors never came back, and after driving it for a total of 5 times and maybe 30 miles, all of the indicators are showing as completed again, so I took it in to get inspected and it came back fine.

Thanks for the help here.

TLDR- don't expect an error or check engine light to just turn off once you have actually fixed the problem. If the things seems to be running fine, it might take some miles and trips to get those cleared.