P0306 CEL Code - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 11-23-2007, 10:35 AM
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P0306 CEL Code

1998 Toyota Sienna CE (sister-in-law's car). At first, it displayed multiple error codes (P0171, P0300, P0303, P0306). After I cleared the codes, only the P0306 code returned (blinking check engine light). I tried switching the coils around, but still got the same P0306 code. Her car runs very roughly. Any ideas on what I could try next?

Thank you for your help !!!
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#2 Old 11-23-2007, 10:59 AM
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The check engine light flashes when there is enough of a misfire to do damage to the catalytic converter, so I wouldn't recommend running it much 'til it's fixed.

P0306 is a misfire on cylinder # 6, which is on the rear bank farthest from the front of the engine. If I remember correctly, you only have three coils on the front with plug wires connecting the coils to the rear bank. If the code stays the same when you switch coils, try moving the plug wires, see if the code follows that. You might also want to pull that plug out and see what it looks like.

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#3 Old 01-26-2010, 08:14 PM
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Check and see if the spark plug for the cyl. that is misfiring is wet with gas. If the fuel injector is stuck open it will flood the cyl. and foul out the plug causing a misfire. I had the same problem on a 99 and a fuel injector fixed it.

Last edited by mfort78; 01-26-2010 at 08:17 PM. Reason: more info
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#4 Old 01-27-2010, 08:42 AM
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Just for the record #6 is on front bank{closest one to oil cap}
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