engine management light
 

hi my engine management light has decided to come on a friend with a code reader has got code p0155 oxygen sensor bank 2 sensor 1 now to me that means bugga all so how easy to change and how much we talking ?
while im on here also the heater in the back only blows cold ideas?
51 plate blue zt 160

MAF sensor i think scratch that just googled and another forum had this

"O2 sensor heater element on the down pipe for the even bank of cylinders was faulty(the one before the cat but not the one nearest the radiator)"

Cant help you with the fault codes but the two rear vents only blow out cold air.:}

As said Oxy sensor rear bank, accessed from underneath the car just by the lower engine mount :)

Lambda sensor in common terms. The first one before cat is usually first to go, very common on all cars these days. I buy universal ones at £16 delivered and you just need to cut the loom to suit. At the price its best to change both. For some reason supermarket fuel over years seems to do them in as the additives arent up to spec due to price etc.
I have a scanner that turns the light off for about 80 miles and then it comes on again. Some scanners come up with a generic code and its not until you get it turned off and comes on again that the reader and ECU give the exact fault.

the sensor has most problerly lost its earth ,the code refers to the heater side of the sensor.supply an earth from body of car and it will b fixed...

[QUOTE=chrissyboy;936859]the sensor has most problerly lost its earth ,the code refers to the heater side of the sensor.supply an earth from body of car and it will b fixed..it could also be that the ecm is just playing silly ******s as it did on my car ,light come on read codes and same as yours ,checked the wiring and all was as it should be good earths put light out and it never came back on