just how sensitive are o2 sensors...seem to have lots fail
Discussion
steveo3002 said:
well the car is bucking badly at low speed around town , occaisional buck on cruise
unplugging the o2 fixes it
And there was me thinking you tested it with an oscilliscope....unplugging the o2 fixes it
Unplugging the lambda sensor will throw the car into a limp mode, which can mask all sorts of other problems.
steveo3002 said:
ive had what seems to be quiet a few o2 sensors die on my golf over the years.i always get bosch ones and handle them with care
just swapped the exhaust over which onvolved remove/refit the o2 sensor and it seems its gone again
are they really that fragile or is there another problem
well?,is it petrol/diesel?,engine cc code?,year of when the thing was knocked up on a production line,just swapped the exhaust over which onvolved remove/refit the o2 sensor and it seems its gone again
are they really that fragile or is there another problem
if u gents need help on pistonheads(year make model and fuel type ffs)madness ?
thong said:
steveo3002 said:
ive had what seems to be quiet a few o2 sensors die on my golf over the years.i always get bosch ones and handle them with care
just swapped the exhaust over which onvolved remove/refit the o2 sensor and it seems its gone again
are they really that fragile or is there another problem
well?,is it petrol/diesel?,engine cc code?,year of when the thing was knocked up on a production line,just swapped the exhaust over which onvolved remove/refit the o2 sensor and it seems its gone again
are they really that fragile or is there another problem
if u gents need help on pistonheads(year make model and fuel type ffs)madness ?
Anyway, my Corrado, which will use a very similar O2 sensor to your golf, went 90K on its first sensor, so yes they are consumables but I wouldn't expect a healthy car to go through more than 2 in its life time.
Silicone kills them very quickly, you haven't used this to seal any induction leaks or in place of any gaskets on the inlet have you?
HellDiver said:
syncro. said:
Its quite clearly petrol
No, it isn't.Pigeon said:
A lambda sensor is pointless on a diesel because they run about 50% lean of stoichiometric even at their "richest" (ie. full pelt) and even leaner at lower outputs, so there is always masses of free oxygen in the exhaust no matter what.
Is it not?... Thanks Pigeon.syncro. said:
HellDiver said:
syncro. said:
Its quite clearly petrol
No, it isn't.Pigeon said:
A lambda sensor is pointless on a diesel because they run about 50% lean of stoichiometric even at their "richest" (ie. full pelt) and even leaner at lower outputs, so there is always masses of free oxygen in the exhaust no matter what.
Is it not?... Thanks Pigeon.That's a 1.9CDTI Astra, and the other was a VW 2.0TDI powered Lancer. The Astra even went in to limp home when the cable from the post-cat lambda got snagged on a twig flicked up from the road.
So, it's not clear that it's a petrol, you moron.
O2 sensors in diesel probably mainly measure cat efficiency. (ie) Difference between pre and post cat signal.
Sensors fail if exposed to overrich mixtures for any period of time, they also should be preheated, hence why newer ones run 12V and ground heater circuits. Older models just had the signal and signal grounds etc. Check your 12v and grounds if its a heated one to check if its preheating nicely. Maybe give it a min or so before you crank the starter with the ignition on to let it preheat etc.
Otherwise maybe your running too rich or something in open loop before it hits closed loop?
Sensors fail if exposed to overrich mixtures for any period of time, they also should be preheated, hence why newer ones run 12V and ground heater circuits. Older models just had the signal and signal grounds etc. Check your 12v and grounds if its a heated one to check if its preheating nicely. Maybe give it a min or so before you crank the starter with the ignition on to let it preheat etc.
Otherwise maybe your running too rich or something in open loop before it hits closed loop?
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