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Advice Needed! P0401, P0300, P0301, P0303 Head Gasket and/or EGR?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by ALTEREG0, Aug 19, 2024.

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  1. ALTEREG0

    ALTEREG0 New Member

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    2010 Prius
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    Base
    Thank you @rjparker! The noises I'm hearing now are not the normal initializing noises (whish I could post a video). Do you think doing a break bleed would help? (still need to find the right OBD2 tool for it :s ). Do I have to replace the ABS module if I replace the break booster/master cylinder?

    No HV battery codes yet, no other issues other than decreased mpg. What would be the best place to get a good deal on a new OEM battery?

    I think it's been 3 weeks since the initial "incident" that started this post. So far the car has been running fine, oil and coolant levels stable (no loss), no overheating whatsoever, haven't done the exhaust test yet. Any other symptoms that I can monitor for a bad head gasket?

    Thanks again for the help!
     
    #61 ALTEREG0, Sep 11, 2024 at 11:44 AM
  2. Mendel Leisk

    Mendel Leisk Senior Member

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    If you're trying to upload directly, that won't work. Best is to upload to youtube, then post a link here. It'll display and play here, free of YouTube commercials too.
     
    #62 Mendel Leisk, Sep 11, 2024 at 12:05 PM
  3. rjparker

    rjparker Tu Humilde Sirviente

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    You can post a video on your YouTube account and then post a link.

    No. I had the dealer do a brake booster bleed years ago when my unit was rapidly losing pressure. $150 and it fixed it for one day.

    The brake booster is actually the combo brake booster/abs/master cylinder issue. It also has a build in ecu which makes it expensive. Labor is many hours. The booster pump is another item. Toyota recommends replacing it as well.

    The brake booster problem is common and was even covered free for ten years 150,000 miles. Now it’s a $2k-$2.5k job unless you are brave enough to diy. Used parts are a big risk because they are used and several part numbers were used in gen3s. Even the same year is different between tire sizes, hatchbacks vs v’s etc and the stamped number on the housing may be the same.

    Hybridpit advertises a $600 mailin your part rebuild service. Still lots of labor and the final booster bleed and calibrations.

    Prius Brakes FAIL (Hidden COST of Hybrids)


    There is a failsafe in the brake by wire system that allows a pair of solenoids to fail open which results in straight hydraulic braking. However it is not power brakes at that point so the normally good ecu controlled brakes are reduced to a system with much longer stopping distances. Some accidents occur because of this. The odds are good failure will occur gradually, eg the weak brake booster will take increasingly longer to maintain standby pressure, eventually tripping a code prior to the manual failsafe mode. I would stop safely if the warning lights come on.

    IMG_6216.jpeg
     
    #63 rjparker, Sep 11, 2024 at 12:12 PM
    Last edited: Sep 11, 2024 at 12:28 PM
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