P0135 Fault Code

patrickgledhill · Unread post by **patrickgledhill** » 26 Jan 2013, 06:39

Hi Guys, Im new to this fourm and just looking for a bit of info re this fault code.

2004 lingo 1.4 150000 km

Engine light is on and lexia shows fault p0135 (upstream o2 sensor fault) i cleared the fault and within 5mins of driving it was back on.

Forgive my ignorance but i don't know much about these sensors.

I have not monitored the readings form the sensor but will do in the next couple of days.

Are there common issues regarding these sensors? im not keen to go out and buy one straight off as you could understand.

Thanks fro any help.

Patrick

oneday · Unread post by **oneday** » 26 Jan 2013, 17:26

the sensors do fail but not to often i would check the cable plug for corrosion first

patrickgledhill · Unread post by **patrickgledhill** » 28 Jan 2013, 08:20

Cheers for that, today I unplugged the sensor and it looked ok so i gave it a spray with grease and put it back together.

I then connected it up to proxia to read and clear the faults and this time i had three. Upstream O2, Downstream O2 and an ignition one.
I cleared them anyway then drove on highway for around 1.5 hours no light the whole way. I stopped for about 20 mins (car off) then got back into the car and pulling back onto the road i noticed it was on again... it was 38 degrees today and very humid not sure if that would effect the car.

Also im up to 38/50 times for clearing the fault codes what happens when 50 is reached?

cheers

addo · Unread post by **addo** » 28 Jan 2013, 08:24

A faulty spark or coil will give antipollution faults, look at your coil dwell times.

patrickgledhill · Unread post by **patrickgledhill** » 28 Jan 2013, 08:34

Hi there, am i able to look at these dwell times in the proxia software?

addo · Unread post by **addo** » 28 Jan 2013, 09:25

You can with Lexia, so I imagine other equivalent software will show ignition parameters. Inspection of plugs themselves is a manual process.

patrickgledhill · Unread post by **patrickgledhill** » 28 Jan 2013, 09:31

Cheers, I have only had the diagnostic kit for a week or so and im still learning, its amazing what can be done. Lexia wasant working very well so i installed proxia and I havent had a problem with it yet fingers crossed, I will check the dwell times and report tomorrow. will inspect and probably replace the plugs also. Cheers

DickieG · Unread post by **DickieG** » 28 Jan 2013, 16:57

patrickgledhill wrote:Also im up to 38/50 times for clearing the fault codes what happens when 50 is reached?

Not a lot, it just means that the ECU won't record further history about fault clearing.

patrickgledhill · Unread post by **patrickgledhill** » 30 Jan 2013, 10:35

Hi all,

I have just finished getting the data from the lingo. lexia and proxia both gave the same results here.

coil for cylinder 1/4 charging time remained stable at 2.5 ms
2/3 charging time was mostly stable at 2.5 but dropped every few seconds to 1.6 ms (this doesn't look right) esp in the graphs

O2 sensors
up stream had a minimum voltage of 0.1 and max of 0.8 (this one fluctuated the most)
downstream had a minimum of 0.7 and a max of 0.9 (remained mostly at 0.8)

ignition advance read from -6.8 to 0.4 at idle and with revs it was 30+ (deg)

cleared the faults again and i noticed that the upstream o2 one doesn't clear but the light does go out. the ignition fault must be the one to trigger the light.

just going to have a look at the spark plugs now will post in an hour or so

cheers guys

patrickgledhill · Unread post by **patrickgledhill** » 30 Jan 2013, 11:07

Ok spark plugs dont look to bad, one was a bit tough to get out but managed ok. the ones installed are bkr6e and not the ngk reccomended bkr6ez type from ngk

are the plugs the right ones??? what do you guys use

cheers

Unread post by **Northern_Mike** » 30 Jan 2013, 11:48

No idea, as mine's a diesel. If no one here can help, there's plenty of info over at http://www.berlingoforum.co.uk" onclick="window.open(this.href);return false; ..

Mandrake · Unread post by **Mandrake** » 30 Jan 2013, 13:50

Seems like you're ignoring the simple and obvious and looking for a more complicated fault - if the ECU keeps reporting that the upstream oxygen sensor is faulty even after the fault has been cleared, then perhaps it is ?

What is the additional data recorded with the oxygen sensor fault when you get more information on it ?

Having said that if there is any chance that you are having an intermittent misfire (which it sounds like you might be) then that must be diagnosed and fixed or ruled out first because a misfire will throw the oxygen sensor into a tizzy.

It measures the amount of free oxygen in the exhaust, ideally there should be none with complete combustion. If a whole cylinder worth of fuel and oxygen goes through without being ignited and burnt it leads to a large excess of oxygen in the exhaust before the catalytic converter which will cause a false lean reading from the upstream oxygen sensor which will confuse the ECU. It will try to richen the mixture to all cylinders in an attempt to compensate and may also retard the timing as it thinks the engine is running very lean.

If it richens the mixture more than a certain amount and yet it still gets a lean reading from the oxygen sensor it may decide that the oxygen sensor isn't reading correctly thus it will log a fault code for the oxygen sensor but the sensor might be telling the truth if there is a misfire.

It's important to rule out a misfire because as well as causing the engine to run poorly and the oxygen sensor reading to be incorrect it can permanently damage your catalytic converter by overheating it. Check the spark plug leads particularly carefully for any signs of damage, even a tiny pinhole can cause a misfire.

Once you're sure there is no misfire if you still keep getting the oxygen sensor fault code reoccurring then it probably just is the oxygen sensor that is faulty...

patrickgledhill · Unread post by **patrickgledhill** » 31 Jan 2013, 00:51

thanks for that, is it possible to get more data on the o2 sensors than just the voltages?

i have noticed that once the faults are cleared the light is out (o2 sensor remains) the light will come on only at a start up. becasue i drove for ages with it off then i started it again and its on. car doesn't seem to misfire at all, i fact it runs very smoothly. do you know about the sparkplugs at all? ive heardd that the z ones are shorter in the thread. if that makes any real difference i dont know.

addo · Unread post by **addo** » 31 Jan 2013, 06:55

As one coil's dwell kept dropping (ie, saturating faster) I suspect it has an intermittent break.

You do need a somewhat trained ear to detect the slight misfire this can give; more commonly noticed symptom is poorer economy and slight lagging on the pedal.

Oh, and I don't recommend Berlingo Forum. All they do is talk about their vans, snow, beer, music, women, meet-ups and there are a couple of members with a solid line of innuendo... We at FCF are much more refined in our tastes and practice.

patrickgledhill · Unread post by **patrickgledhill** » 31 Jan 2013, 07:09

hmmm, very interesting tomorrow morning i will monitor it again and listen carefully for the misfire. i noticed that when the accelerator pedel was pressed fast the motor would knock a wee bit (with a very small/quick stutter) and when i did this while recording the graphs for parameters the drop is noticed. We are in Townsville are you still in NSW?

yeah i did post but im not very hopefull after reading through the forum

thanks for your input

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