Hi, I've got a 2003 Punto 1.2 8valve active sport, I bought the car needing an engine, fitted a good engine but I've got the code po135, I've replaced the lamba with a genuine part. & still have the code, I've swapped the to lambas across & still the same, I've changed the ecu etc & still the same, I've now just swapped the wiring harness on the engine & still the same, when driving the car when warmed up it starts to miss & run on 2 cylinders, dip the clutch & it's revs free & clear, iam now wondering if it's the temperature coolent sensor? The diner car for the engine didn't have a temperature gauge & iam now thinking the sensor could be differant? Any help or advice on this would be greatly appreciated.

Hi mate

The temperature sensor is the same on a car without a dash temp gauge as it is on one with a gauge. Its unlikely that both engines would have had a faulty CTS, but have you looked at the live data for it to see if its giving the correct readng?

The P0132 error, have you checked the relay and the fuse for the lambda heater circuit?

Alan

Hi , the codes iam getting are po135 & if I swap the plugs across po141 I've binned the old engine with the old temp sensor on & as I bought the car with a seized engine I don't know if it had the problem before? It's driving me mad !!!!

Hi mate

the p0135 refers to sensor 1 and P0141 refers to sensor 2. So if the code is swapping round as you swap the lambdas around, it suggests that one particular lambda sensor is faulty.

Ie... you get the p0135 code (sensor 1 pre cat) you then swap the pre cat sensor to the post cat, and you will then get p0141... therefore that lambada sensor is faulty... if that makes sense?

If it was a wiring issue, or anyting else, it would be highly unlikely that the fault would change locations. Ie if it was wiring, you wold always get P0135 regardless of which way around you had the sensors.

Alan

:yeahthat:

Hi, what I ment to say is that if I leave the lambas in & just swap the plugs on the harness side, if you get my drift.

Same thing applies though, its saying that the heater circuit is faulty... changing the plugs around is just the same as switching the lambdas around from a heater circuit point of view.

Alan

Ok, might try another new lamba, I'll try anything to get it fixed.

Hi,

If you have a multi-meter you can test the heater circuit on the lambda to make sure.

I have to say though, that fixing this particular fault should clear your EML and fault codes, but MAY not get rid of the misfire that you have when warm. I would certainly start with the lambda first though.

Alan

Thanks for the advice, going to try a lamba tommorow & I'll let you no the result, thanks again, ken.

swap them round so the fault is showing on the after cat sensor, then disconnect the after cat sensor cos it does not do anything, put your hand up the back of the clocks and take out the mil light bulb, mine ran fine like this for 2 year and passed 2 mot till i traded it in for a newer panda

jon1612 said:

swap them round so the fault is showing on the after cat sensor, then disconnect the after cat sensor cos it does not do anything, put your hand up the back of the clocks and take out the mil light bulb, mine ran fine like this for 2 year and passed 2 mot till i traded it in for a newer panda

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you cant take the bulb out its part of the circuit board
why ignore a problem?
cheapest solution is a s/h lambda from a scrapper rather than hiding warnings that might just save you fuel

daft thing is i agree with you, fix fault rather than hide it. only thing is whoever i bought punto off did that and wasnt till i got code reader to reset faulty airbag light did i find out the mil light should have been on due to lamba sensor being open ciruit heater was only when i looked to see which one it was did i discover the empty socket, and could not find where the sensor actualy fitted after the cat, there was nowhere to screw one in

jon1612 said:

daft thing is i agree with you, fix fault rather than hide it. only thing is whoever i bought punto off did that and wasnt till i got code reader to reset faulty airbag light did i find out the mil light should have been on due to lamba sensor being open ciruit heater was only when i looked to see which one it was did i discover the empty socket, and could not find where the sensor actualy fitted after the cat, there was nowhere to screw one in

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so they fitted an early punto cat

No I want it fixed properly, it needs to go for mot, quite happy to buy another lamba if it fixes the problem.

s and b said:

so they fitted an early punto cat

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yes either that or a different engine as there were a few other issues as the bracket for the dipstick had nowhere to bolt to and the cat tin plate cover was missing not sure if both related

Well thanks guys, put a new lambda on this morning & cleared the codes & the cars spot on & sitting at the mot station ready for test. Thanks for your advice.

Hi,

No worries mate, glad its sorted

Fingers crossed for the MOT

Alan

youngest's 2001 1.2 8v has developed same issue after swapping the cat/exhaust manifold yesterday as it had cracked at the point where the post cat lambda fits ie most stressed point on the pipe right on the bend, pre cat lambda came out no prob the post took a grinder, a dremel and a hacksaw to cut it out so assumed any issues we'd have would be with that one.. nope - PO135 on ecuscan ie pre cat, cleared fault came back, swapped sensors round and now PO141 ie post cat and with 0.000 volts showing open loop so it's the sensor that was in pre cat position at fault - can't believe how expensive these things are - will check local factors tomorrow - any brands to avoid?

yes cheap ones
buy one with proper plug on end or consider s/h from a local breaker to keep costs down