blown o2 sensor??? code 44

[PaRaDoX]

hey, ever since i put my engine back together ive been getting a
code 44 error: Oxy sensor overvolting...
cars been running really rich and using 20L/100km

i did the o2 sensor recently but maybe its broken?? was passing some water through the exhust before i took it apart

anyway i know they'res more than 1 error for o2 sensor (code 13 aswell)

any thoughts??

[88GreenVN]

Temp sensor? if it thinks the car is cold it gives it more fuel....

[PaRaDoX]

Code Explanation
12 No spark pulses at CPU or else good system, no codes
13 Oxygen sensor output remained at .35-.55 volts for more than one
minute after warmup. Possible open circuit.
14 Coolant sensor indicated a temperature above 130C for 3 seconds
after engine ran for 20 seconds. Probably a short
15 Coolant sensor indicated a temperature below -30C for 3 seconds
when MAT > - 13 or engine running over 1 minute. Probably open
circuit
21 Throttle pos sensor above 2.5 volts for 2 seconds when engine
speed below 1600 rpm
22 Throttle pos sensor below .2 volt for 2 seconds while engine running
23 MAT sensor shows < -30 degrees C for 3 seconds after engine
running 1 minute or coolant > 30C. Probably an open circuit.
24 No speed sensor pulses when engine between 2000-4000 rpm,
throttle closed, high vacuum, not in neutral and all for 5
seconds
25 MAT sensor showed above 145 degrees C for 2 seconds after
engine ran for over 1 minute. Possible short circuit.
31 Unknown Error Code
32 Unknown Error Code
33 MAP sensor voltage too high (> 4.00 v). Possible vacuum leak to
sensor or faulty sensor.
34 MAP sensor voltage too low (< 0.25 v) with ignition on or
engine running >1200 rpm and throttle open >20%
35 Closed throttle idle speed is more than 75 rpm above or
below correct value for more than 45 seconds
41 No Crankshaft reference pulses. Ignition voltage < 11 volts etc.
42 Open or short on EST or BYPASS line to ignition module.
43 Engine Knock Sensor open or shorted.
44 O2 sensor showed < 0.250 volt for over 20 seconds while
operating closed loop
45 O2 sensor showed > 0.550 volt for over 50 seconds while in
closed loop with engine running over 1 minute and throttle open
more than 2%
51 Check insertion of MEMCAL in socket and bent pins.
52 Check that CALPAK is in place, fully inserted, and no bent pins
53 Car's alternator has produced >17.1 volts for over 2 seconds.
Check charging system
54 Unknown error code
55 ECU A to D error. Check ECU grounds, or excessive input voltage

Trouble codes by fault type

Problem Code(s)
NO problem 12
Oxygen Sensor 13, 44, 45
Coolant Sensor 14, 15
TPS (Throttle) 21, 22
MAT (Temperature) 23, 25
MAP (Pressure) 33, 34
Speed Sensor 24
Crankshaft Sensor 41
Spark timing 42
Knock Sensor 43
Memcal problem 51, 52
Alternator overvoltage 53
Control unit input 55


the sensor is less than 5,000km old.....

[xcop5l]

the oxygen sensor is only theyre for a basic reading of what goes on it dosnt controll much of the fuel mixtures its more based on the coolant temp sensor

[PaRaDoX]

the oxygen sensor is only theyre for a basic reading of what goes on it dosnt controll much of the fuel mixtures its more based on the coolant temp sensor

ohh k.. well its running VERY rich, can smell the petrol in the air...
how much do new temp sensors cost???

[88GreenVN]

ohh k.. well its running VERY rich, can smell the petrol in the air...
how much do new temp sensors cost???

Not much from the wreckers (best place for cheap VN bits) $10.00 maybe.

Dont know what they are new - but if you have to get 1 from Holdens take an arm n leg just in case...

[PaRaDoX]

ive got a spare one.. ive got a spare engine :P

[GE4CE]

the oxygen sensor is only theyre for a basic reading of what goes on it dosnt controll much of the fuel mixtures its more based on the coolant temp sensor

What oxygen sensors do link :http://www.autotap.com/oxygensensors...n_sensors.html

Theres the link too what oxygen sensors do,ive just changed mine and for the $40 dollars i paid for it i will easily get that back in full, on petrol savings

[vt1538]

the oxygen sensor is only theyre for a basic reading of what goes on it dosnt controll much of the fuel mixtures its more based on the coolant temp sensor

You should slap whoever told you that rubbish. The oxygen sensor is an important part of closed loop fuelling & is the only feedback the computer recieves directly related to combustion.
As for the sensor problem. If there was still moisture in the exhaust & it got on the sensor when it was hot it will destroy the sensor.
The other things you can check are the map sensor,fuel pressure, oxygen sensor vent & earth circuit.

[pandaman]

You should slap whoever told you that rubbish. The oxygen sensor is an important part of closed loop fuelling & is the only feedback the computer recieves directly related to combustion.
As for the sensor problem. If there was still moisture in the exhaust & it got on the sensor when it was hot it will destroy the sensor.
The other things you can check are the map sensor,fuel pressure, oxygen sensor vent & earth circuit.

VN's only use a narrowband sensor which means it's basically just a rich/lean switch and the signal is only directly used for fuel metering at 14.7:1, I think that's kinda what he was trying to say. A faulty coolant temp sensor can have a fairly disastrous effect on mixtures and provides a plausible explanation for the symptoms described, that is if the code was as originally described, "overvolting". In fact code 44 is undervolting, registering lean. If the sensor is reading lean and the fuel consumption is through the roof then logically the O2 sensor is the likely candidate.

[vt1538]

VN's only use a narrowband sensor which means it's basically just a rich/lean switch and the signal is only directly used for fuel metering at 14.7:1, I think that's kinda what he was trying to say. A faulty coolant temp sensor can have a fairly disastrous effect on mixtures and provides a plausible explanation for the symptoms described, that is if the code was as originally described, "overvolting". In fact code 44 is undervolting, registering lean. If the sensor is reading lean and the fuel consumption is through the roof then logically the O2 sensor is the likely candidate.

Only a very few of the later model cars use a wideband sensor as they are an expensive item. The narrowband as you say is only accurate at stoich so is used as a lean/rich switch to control fuelling. However the computer will trim the fuel if the narrowband isnt switching properly. If the voltage remains low it will add fuel, if it remains high it will remove fuel. These trims will stay in the computer until reset or the problems are fixed. Since no two engines are the same this is how the manufacturers have been able to run a generic tune to suit all the engines in different conditions & different wear limits.
I agree that the o2 sensor is the likely candidate, but there are a few other issues that can be easily checked first.

[samuels]

hey, ever since i put my engine back together ive been getting a
code 44 error: Oxy sensor overvolting...
cars been running really rich and using 20L/100km

i did the o2 sensor recently but maybe its broken?? was passing some water through the exhust before i took it apart

anyway i know they'res more than 1 error for o2 sensor (code 13 aswell)

any thoughts??

isn't code 44 dodgy ECU?or is that code 45

[pow3rslave]

i've recently been getting faults too, haven't checked the codes yet, but i'm fairly sure it's O2 (happened since extractor install)
it seems to come on more if i'm using cruise and the engine is on low revs.
as i said, i've heard extractors often cause 02 sensor problems, is there any way to stop this, or an 02 sensor replacement that will fix the prob?

[vt1538]

The problem with extractors is the O2 sensor does not get hot enough to give a reading consistently. You can try heat wrap on the exhaust around where the sensor sits or a later model 3 or 4 wire O2 sensor with the heater circuit.

[samuels]

The problem with extractors is the O2 sensor does not get hot enough to give a reading consistently. You can try heat wrap on the exhaust around where the sensor sits or a later model 3 or 4 wire O2 sensor with the heater circuit.

You should slap whoever told you that rubbish. [Quote]

never had any troubles with O2 sensor and extractors in my time with VN's or any other car for that matter

[vt1538]

[QUOTE=samuels;565111]You should slap whoever told you that rubbish.

never had any troubles with O2 sensor and extractors in my time with VN's or any other car for that matter

HAHAHA
It is actually a common issue with a few makes & models that fault codes start showing after the fitment of extractors. It is all to do with the sensor being in a colder part of the exhaust stream & not getting up to temp fast enough. Power3lave wasnt talking about code 44 he was talking about a code immediately after fitting extractors. More than likely code13.

[samuels]

[QUOTE=vt1538;565189]

You should slap whoever told you that rubbish.

HAHAHA
It is actually a common issue with a few makes & models that fault codes start showing after the fitment of extractors. It is all to do with the sensor being in a colder part of the exhaust stream & not getting up to temp fast enough. Power3lave wasnt talking about code 44 he was talking about a code immediately after fitting extractors. More than likely code13.

not saying it doesn't happen ,but in my 25 years of fitting extractors(O2 sensors were only just coming in mid 80's)i haven't experienced as many faults as described,i have come accross probably 2 and they were actually dicky O2 sensors,replaced and all good.

[Not_An_Abba_Fan]

I'm with samuels, 18 years of fitting extractors, the sensors that need replacing were buggered anyway, the extra flow created by the extractors just made the error show up. A lot of engine light issues in later model cars were due to the shift points being changed in the transmission.

[Not_An_Abba_Fan]

So PaRaDoX616, has this issue been fixed by swapping sensors from your other engine?