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Old 01-07-2004   #1
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Pressure sensor???

Car just failed its MOT(2000 punto 1.2 8v)due to high CO on emissions test.Apparently the computer had codes for pressure sensor(whats that?) & evap valve(whats that?).
All sounds very expensive but told the lambda sensor wasnt working but thats not the fault as was changed,and the engine light is not on,any ideas? Thanks
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Old 01-07-2004   #2
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thats apsolute pressure sensor, detects engine manifold depression and the evap valve is a valve that evacuates the carbon canister.
if you've ever done a cat test on a mk2 punto you will know their a pain in the ass too pass the fast idle test because the engine wont maintain a steady speed without any load, lots fail mots on high co because of this.

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Old 01-07-2004   #3
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Thank you for the reply,apsolute pressure sensor thats under the air cleaner just to the right of the injection(throttle body)unit?
Failed with 6% CO apparently?
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Old 01-07-2004   #4
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My Mot Tester said it wouldnt maintain a contant Fast idle speed so he just ignored it as it passed the normal IDLE and every other test:)

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Old 02-07-2004   #5
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It failed the idle test(high CO),apparently the lambda sensor and the combined temp/air pressure sensor was changed but still the same.Also the computer(examiner)cannot clear the pressure sensor fault as it keeps coming up as soon as the ignition is switched on:(Also the EVAP sensor keeps coming up as faulty as well?
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Old 08-07-2004   #6
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For some reason 'ECU' kept going through the back of my mind so I tool it off & sure enough green corrosion on 2 of the pins.New ECU & all concerns solved,thanks all who helped;)
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Old 08-07-2004   #7
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[:0] really, ecu corrosion.
thats well worth knowing for the future, thanks.

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Old 12-07-2004   #8
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Yep Kebab,bottom left hand pin on connector A was all green/corroded,never saw it until I took ECU off to inspect it,water was obviously sitting in there for sometime but was dry when I looked at it.Seems alot of puntos have ECU faults even though they often record coil fault codes!
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