Please help!!! p0300 - Lexus IS Forum
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post #1 of 3 (permalink) Old 01-12-2013, 02:36 PM Thread Starter
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Please help!!! p0300

I have an 01 is300 stock.... I have the following codes p0300, p0304, p0305, p0306 and bank 2 too rich.... I have replaced plugs and wires with oem and the problem went away for about a 1000 miles and now it's back..... Please help!!!
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post #2 of 3 (permalink) Old 01-12-2013, 03:43 PM
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Are you sure all ignition wire connectors are locked into the coil packs? What plugs did you put in?

These are all the causes of DTC P0300..
-open/short in engine wire
-connector connection
-vacuum hose connection
-ignition system(all replaced on yours)
-fuel pressure
-MAF
-engine coolant temp sensor
-compression pressure
-valve clearance
-valve timing
-PVC piping
-ECM

Check the vacuum piping near the driverside firewall and clean your MAF as wellnas throttle body. Then reset your ECU and see if a specific cylinder misfire comes back. I would also verify your other bank isn't running rich, which would narrow it down. You aren't running extremely rich or you'd be throwing P0172/P0175 rich codes.

'02 IS300 MSM LSD
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post #3 of 3 (permalink) Old 05-19-2014, 08:39 PM
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Hate to bring this from the dead as my first post but i have the exact same codes. What did you find out was the culprit?
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