Need Help. Code 44 02 lean

[Haydz]

hey guys.

i need your help.


lately i have been having problems with my 02 sensor..


here is the scenario

Car: Vr Berlina

Motor: VP Buick

Trans: T5

Wiring loom vn series 2 manual

im just wondering would the fact that the 02 sensor is down near the bottom of the gearbox affect the 02 sensor as they are in a different place on the vn's

i also have pacemaker headers which have a spare hole with a blanking plate in that could also take a 02 sensor.


any input or help with my problem will be much appreciated.

[Cheap6]

Try:

There is actually an excess of oxygen in the exhaust. That might be caused by an ignition system fault or engine mechanical (including fuel system) fault.

The O2 sensor circuit is broken somewhere between the sensor - ECM - earth. This could be in the wiring/connectors or perhaps between the sensor housing and the exhaust (screw thread).

The sensor is dead from old age or damage, or the external surface is plugged with mud, and therefore not generating a voltage.

The new position of the sensor in the exhaust has lowered the temperature that the sensor operates in and that has screwed the voltage output. Also, the heater for the sensor may not be working correctly. That would be apparent virtually immediately after the exhaust was installed. The mix between engine, harness and ECM (PCM?) may have something to do with that (VN S2/VP V6 sensors aren't heated).

[Not_An_Abba_Fan]

Is it a one wire? If it is it won't be heated.

You can try moving it, or maybe you have a vacuum leak somewhere.

[Haydz]

hey not an abba fan i think your on the money with the vacumn leak.

as i was only getting the error on gas. so i pulled off the converter from the throttle body.

and made sure it was a tight connection. used a bit of eleccy tape. to create a bit of a seal.

and it seems to have gone away.


i just put in a brand new sensor. and i am running a 2 wire sensor the one that is correct for the loom.

i will report back if i get the dreaded engine check light again.

cheers for the input guys.

[Haydz]

i got the dreaded code 44 again today.. im going to make sure its tight underneath.


if not im fresh out of ideas

[Cheap6]

Step one would be to see if you get it on both fuels. That will go some way to determining whether it's a tune issue or something else.

[Not_An_Abba_Fan]

Most people on gas get some sort of O2 sensor error when running on gas. I wouldn't worry too much about it if it only happens on gas. Especially if the gas is tuned for economy. Are you noticing any power drop running on gas?

[Haydz]

hey guys . it does it on both petrol and gas.

and now my exhaust is starting to get clogged with black **** out the back.

not sure why this is happening. surely it couldnt be because of the different location of the 02 sensor?

[Cheap6]

If it's on both fuels there's a problem unrelated to the LPG tune then. The black **** sounds like it's the sensor telling the ECM it's lean when it's not.

If it's the sensor location, it will only have started immediately after you fitted the extractors, not (say) months later but if it's easy to move, there's no harm in trying it.

I think that VR O2 sensors are different to VP and are heated but I'm not sure with the manual trans. It's not so much whether or not the sensor matches the wiring but whether or not it matches the ECM in terms of setting the code. Was the old sensor the same? What's the story re. the mix of wiring, car and engine?

The O2 sensor is essentially a little battery, with a voltage varying in response to the difference between exhaust O2 concentration and that in the air. Anything that causes a voltage drop in the circuit between sensor and the ECM will alter the reading the ECM 'sees'. I've posted in another thread how to carry out a very basic check of O2 sensor operation if you have access to a voltmeter. One thing to try is to check the voltage that is present at the ECM terminal for the O2 sensor relative to a known good earth, then relative to the earth specific to the O2 sensor.

[Haydz]

hey man well im running the right sensor for both my wiring and my ecu. so thats not the problem.

i guess i will have to test my wiring and see if that is what is causing so many problems. thanks again.

the location of the 02 sensor shouldnt have that much affect i would think.

[Chirpstr]

Haydz, put it in the other hole near the cat. I remember Greenfoam was telling me about getting o2 codes sometimes when you have extractors and they heat up...

[Haydz]

well i have tried it in the top hole and it still has the same problem but less often.

i cleaned the codes from the ecu. went for a drive. with cruise on at 70 in 4th

and ding. AHHHH 02 sensor again what a pos.


so yeah i dont know wtf is wrong with it.

im going to give my throttle body. iac and tps sensor a good clean tomorrow and see if this fixes it at all.

thanks again guys.

[Haydz]

also could be caused by a dodgy fuel pump so im told. or a dodgy earth/ecu.

i havent changed my fuel filter for almost 12 months so im going to change it and see how i go. also cleaning the throttle body.


and who said max ellerys manual was shit. just takes all day to find the part you want

[moff_man]

may i ask what computer are you running?

[Haydz]

vn series 2 manual ecu. and the 02 sensor and wiring loom are all from the same car

[moff_man]

ok i was thinking it may of been a ecu to wiring issue but that seems invalid now

[Haydz]

hmm really all my running gear is from a vn series 2.


but more onto the situation. i pulled my fuel filter off. it was full of shit like badly so that would have not been good for the fuel flow.

i put a new one on and it split a hole in it and leaked a bunch of petrol out. but yeah i will be taking the old filter back to peps tomorrow and getting a ryco instead of a cooper

[Haydz]

new filter is in.


02 sensor cleaned.

throttle body cleaned

IAC cleaned.

runs much smoother now. will see if i still get this dreaded engine light. thanks for all the help thus far guys

[Haydz]

still been getting the 02 lean error code.

i honestly dont know why but i drove about 4 hours away and with the 02 sensor close to the motor. position 1. the car used about 45 litres of fuel. and the engine light was a sometimes occurance. it was all highway


i then changed the sensor while i was up there and put it in the location near the gearbox location 2.

this used drastically less fuel at 25 litres for the trip back. and with no engine light so far.

i believe the problem may be in the grounding of the ecu./ 02 sensor. as it is an intermittent problem and happens at random times.

so i will look for the ground point and see if i can improve it? clean it whatever it takes to ensure it has the best ground possible. then will report back on how that goes.


thanks for all your help again guys


i know the concept of my bittsa car can be hard to grasp.

[W84N01]

WHatever you do just remember that whilst on gas your O2 light will always come on no matter what.

My VN Series 1 is on straight gas, no fuel or fuel tank at all, and that is the one thing that really gets up my goat all the time. The O2 light will flash at me.

Hope you get your problem fixed mate.

[mrhotdog]

WHatever you do just remember that whilst on gas your O2 light will always come on no matter what.

My VN Series 1 is on straight gas, no fuel or fuel tank at all, and that is the one thing that really gets up my goat all the time. The O2 light will flash at me.

Hope you get your problem fixed mate.

not entirely true, i run mine on duel fuel but mostly gas, i had a problem when running petrol and it turned out to be a dodgy earth. earth fixed, runs fine. also had light come up after i had it installed, turned out they put the wires round the wrong way.