my vectra was driving fine went on motorway put the foot down juddering smokey no power pulled over then power came back slowed down same problem power comes back for a minute then nothing stopped car at home ant the exhaust was crackling as if it was to hot checked coolant was luke warm any ideas engine light on

jer nash, May 2009

o2 sensor is this a easy repair or do i have to go to a garage

jernash, May 2009

Is it the engine management light? If so you need to get the codes read.
Depending on the model year you may be able to do it yourself. You'll need a pen and paper.
Press down the brake and accelerator pedals (accelerator right to the floor) and keep them down.
Turn ignition on ( dash lights on, don't start engine).
The EM light should start to flash. Count the flashes in groups of four.
For example, 10 flashes, short gap, 3 flashes, short gap, 4 flashes, short gap, 10 flashes-- longer gap-- 10 flashes, short gap, 1 flash, short gap, 2 flashes, short gap, 10 flashes, longer gap.
It will keep flashing until all codes are done then start at the beginning again.
The codes above would be 10-3-4-10, then 10-1-2-10.
As 10 flashes represent zero, that gives us 0340 and 0120.

0340 = camshaft sensor
0120 = Throttle Potentiometer Sensor (TPS)

If this method works post up the codes you get. If it doesn't you'll have to go to a garage or diagnostics specialist.
Alternatively, buy a code reader or diagnostic software such as op-com.

daker 2020, May 2009