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CEL: Codes P0300, P0301, P0302, P0303, P0304, P0306

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Old 12-05-10, 07:04 PM   #1
sktn77a
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Default CEL: Codes P0300, P0301, P0302, P0303, P0304, P0306

Hi all:

Our 1999 RX300 (we've had it since new) is idling and driving a little rough (not as bad as a typical bad coil misfire). The code reader is putting out codes P0300, P0301, P0302, P0303, P0304, P0306. We had 1 coil replaced about 18 months ago so that might explain why we're only getting 5/6 cylinder misfire codes(?) But I can't believe that all 5 coils would go out at once.

EDIT: I checked the service records and it was cylinder 5 coil that was replaced!

Any other ideas that could cause a general misfire code reading?

Thanks

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Old 12-05-10, 11:47 PM   #2
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Quote:
Originally Posted by sktn77a View Post
Hi all:

Our 1999 RX300 (we've had it since new) is idling and driving a little rough (not as bad as a typical bad coil misfire). The code reader is putting out codes P0300, P0301, P0302, P0303, P0304, P0306. We had 1 coil replaced about 18 months ago so that might explain why we're only getting 5/6 cylinder misfire codes(?) But I can't believe that all 5 coils would go out at once.

EDIT: I checked the service records and it was cylinder 5 coil that was replaced!

Any other ideas that could cause a general misfire code reading?

Thanks
Without exception, I always cancel the TC's and see what comes up 1st. I can't even imagine it showing 5 legitimate misfires, or bad coils. I don't know why it some times spills it's guts 1st. time around, but common sense says disregard and see what comes up 1st. on the second go-around. A million to one it won't be the same.
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Old 12-06-10, 04:52 AM   #3
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Tried it; got the same codes after re-setting last night and again this morning:

UIF
01
02
03
P0300
P0301
P0302
P0303
P0304
P0306

I believe the first 4 are unique to my reader.

Guess it's a trip to the stealer!

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Old 12-06-10, 12:44 PM   #4
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Well, It was the coil on #4 cyliner - is that at the back or the front?

$300. I guess it could have been worse.
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Old 10-24-15, 10:48 PM   #5
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I have similar issues with my lexus rx330. The check engine light keeps blinking, the car shakes even when stationary with the engine on especially in traffic, and the car does not ride smoothly on the high way.

I took it to a mechanic workshop/servicing centre where it was suggested that it's engine spark plugs problem which I let them change all six. The air filter and adjacent parts were cleaned including the air flow meter. However, prior to the development of this "flashing check engine light" they have changed the passenger front shock absorberror, both shaft tubing protector, and the two steering locks (the thyroid, the previous day. The problem continues.

Today, I had the car scanned and got these codes:
C1223 (malfunctioning ABS)
C1246 (malfunctioning master cylinder pressure sensor)
P0304 (s1 and s2)

Please I need help for the interpretation of these results/code and how I will sort out these problems.

Thank you all in advance.
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Old 10-25-15, 12:46 PM   #6
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Originally Posted by lecturer View Post
I have similar issues with my lexus rx330. The check engine light keeps blinking, the car shakes even when stationary with the engine on especially in traffic, and the car does not ride smoothly on the high way.

I took it to a mechanic workshop/servicing centre where it was suggested that it's engine spark plugs problem which I let them change all six. The air filter and adjacent parts were cleaned including the air flow meter. However, prior to the development of this "flashing check engine light" they have changed the passenger front shock absorberror, both shaft tubing protector, and the two steering locks (the thyroid, the previous day. The problem continues.

Today, I had the car scanned and got these codes:
C1223 (malfunctioning ABS)
C1246 (malfunctioning master cylinder pressure sensor)
P0304 (s1 and s2)

Please I need help for the interpretation of these results/code and how I will sort out these problems.

Thank you all in advance.
This is yet another cross post.
Your questions were answered here
http://www.clublexus.com/forums/rx-1...ine-light.html

Salim
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0300, 1999, 2002, 300, 530i, bmw, code, lexus, p0300, p0301, p0302, p0303, p300, rx, rx300

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