fault code help please

[soulrebel]

Hi all further to my last post, anti pollution fault/engine light coming on. have now got a fault code reader and have the following 2 x faults. p0141 02 sensor heater /circuit bank 1 sensor 2. and p0203 injector sensor /open cylinder 3

not quite sure where to go from here as to exact diagnosis .... any help please

cheers
ferg

[gazza82]

I think P0141 O2 sensor is the lambda after the cat. Check that the connectors are clean and pushed on tight (pale blue and pale green connectors near back of engine bay and to right of engine). You should have two Lambda's ... pre-cat in down pipe and post-cat under car but your car is newer than ours so there may be more!

Most Lambda sensors are the same apart from the cable and connectors. A cheaper option may be to get a Bosch universal (double-check the part number on bosch website) which you splice into the existing wiring, without soldering, and save a few quid in the process. That wiring costs a lot of money!

Don't bother with after-market lambda or even NTK versions .. they tend to cause more problems that they solve!!!


P0203 sounds like you have a duff injector which is sticking and possible over-fueling, hence the lambda readings. Try some injector cleaner in the fuel first ... it may un-stick. Also check the wiring to it is tight and clean. Cylinder one on a Pug is the right hand gearbox end, but check all four!


I'm sure Capncol will be able to confirm/correct me on these ...

[GrandadMonkey]

I'd sort out the injector problem first. Once that is done any unburnt fuel deposits on the lambda sensors will most probably burn off and the anti-pollution light should go out.

[Capncol]

To check the lambda sensor (the one furthest from thew engine) unplug it and locate the 2 wires of the same colour going towards the sensor. They are normally black or grey. Using a digi meter you should see a resitance (cant remember value) but if it's open or short circuit it's faulty.
The injector code sounds like a stored code or I would expect you to have a misfire or uneven idle.
Try clearing codes and see what comes back.