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http://www.samarins.com/diagnose/p0128.html My wife's saturn vue is also throwing the same code. I'm starting with the thermostat because we just did the radiator (leaking) so I know there's no blockages there.
Code P0128 is for the cooling system you should replace the thermostat. Code P0130 H02S circuit closed loop (cl) performance (bank1 sansor1) you have to replace the #1 oxygen sensor.
Code 155 is for a problem with the heater circuit in the O2 sensor for bank two. Bank two is on the side with cylinder number two. Usually the sensor is faulty, but the heater circuit would need to be checked to be sure. The sensor has a built-in heater to get it hot quickly after starting the engine.
po420--- catalist efficiency below threshold--- possible fix. a po420 means that one or more of the following has happened. the easiest thing to do, is erase code with scanner. and see if it comes back. the engine coolant tempuature sensor may not be working properly, damaged exhaust manifold, or catalytic convertor may be bad. check 02 sensor also behind convertor towards rear. its really hard to say can be anyone off above!! but check 02 sensor first it may be bad.
Well, the po401 is saying is that the egr valve has restricted flow. After changing the egr and the tube, something else is causing the restriction. a more thorough diagnosis is recommended. The po420 code sounds like a possible catalyst failure or an o2 sensor failure.
Sounds like the thermostat may be stuck open or
has anyone put a colder thermostat in the car,because once it starts to
get cold it will throw a SES with a colder then stock thermostat.
Code PO128; coolant temp below thermostat regulating temp. Replace the thermostat and that should address your issue.
I could go on and on about Po420 code but it's easyer to tell you to go to www.po420.com and everything you want to know and then some is there. Let me know if this was helpfull..4 thumbs up !
2004 chevy malibu crank no start/ scan computer found code b2930, basicly computor forgot the chip inbedded in key,turned on ign for ten minutes cycled key and car started has been fine for two(2) days
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