ECU in safe mode..

[vtecjdm]

This may sound like a dumb question.
Ok here it goes .. my ecu usdm p28 is running in safe mode right now cause i got an o2 sensor (cause my engine runs a 1 wire sensor) and VTP error code.

I`ll eventually chip it using uberdata and will get rid of these codes but what i wanted to know is ... what does actually make the ecu run in safe mode ?
Is it literaly ANY CEL code ? .. or maybe just certain imp CEL codes ?

Thanks

 

[posol]

only a handful of critical errors put the ecu into limp mode. its for your own good really. basically, if the ecu can't determine what a certain sensor is reading, it defaults to its base program so you don't go blowing things up.

as for your 1-wire, convert to 4. just buy a 4-wire o2, and wire it up to the correct pinouts. its better than a 1-wire and will provide a better warm-up cycle.