Located in the front exhaust section between the manifold and the cat on my 2.0 20v - probably the same on the 1.6 engine I would think.
Ive heard nothing but bad comments about universal lambda sensors. Always see people saying to get genuine bosch ones.
hi there there is no sutch thing as a universal 02 sensor as there are too many engine sizes therefore to many voltage ranges to make one sensor do all engines there idea is ludicrous believe me ..shuggy..
should be in classifieds but seeing as i totalled mine i might let you have one cheap
Indeed it should.. 24hrs to make your ad then ill bin this thread.
Thats what a lambda sensor should do so its not your problem.
check the heater and probe resistance with a multimeter. remove the black plastic cover at the back centre of the engine bay. there are 2 knobs you need to loosen to remove it. behind that cover you will find the lambda sensor wiring connector. disconnect it and then use the connector to test the lambda sensor. make sure you use the correct side of the connector you need to use the side that has the wires surrounded in a white sheath this is the side that goes down to the lambda sensor. the following pic gives more detail. Attached Thumbnails   __________________ 2.0 twinspark veloce   Quote   05-03-2007   4 rafy Get Your Own Title Join Date Jan 2007 Location Caracas Posts 11 Thanks 0 Trader Rating 0   Re lambda up down voltage irregular running Originally Posted by jug check the heater and probe resistance with a multimeter. remove the black plastic cover at the back centre of the engine bay. there are 2 knobs you need to loosen to remove it. behind that cover you will find the lambda sensor wiring connector. disconnect it and then use the connector to test the lambda sensor. make sure you use the correct side of the connector you need to use the side that has the wires surrounded in a white sheath this is the side that goes down to the lambda sensor. the following pic gives more detail. Jug I tested the heater resistance and is correct. If I connect the lambda to ECU the lambda tester show a movement of led from 1 to 5 constantly. In my country the fiat tester is very difficult to find. I connected my elm323 (Scantool) but dont work.
you should see the lambda voltage going up and down constantly this indicates that the lambda sensor is responding and the ECU is switching from rich to lean to keep the fueling correct. So its basically working. What performance problems do you have
Originally Posted by rafy My marea have a rare problem. When the car is cold it have more power but when hot don&180t have the same power. thats not rare. its probably the lambda sensor Originally Posted by rafy Too the car have jump o accelerate or brake abruptly if I go in traffic at 2 gear and release the accelerator brake abruptly and if put the accelerator jump abruptly too. thats normal use 1st
Hello again. Thanks for the info located the sensor 4 wire rectangle type plug. BUT...... my local Dingbro motor factors has just informed me there is another sensor towards the rear of the exhaust I had a new exhaust system from the cat back fitted last month. Did not see anything that resembled a place for another lambda ... Where would it be fitted Ill go climb under again and have a look... Thanking you already... Rascal808
Hi mate Yes if yours is the later model you will have a pre and post cat lambda . The pre one is on the exhaust manifold and the post one is just below the cat which is the big bit just after the manifold . If you have the CF2 version then there is only 1 lambda sensor. This is located on the downpipe just after it turns 90degrees and goes under the engine where the 2 pipes turn into 1. Hope that helps Alan rascal808 thanked for this post
Well we shall see if the emissions are OK this afternoon. Fitted the new lambda a new Air filter a new set of spark plugs. The car does seem to sound sweeter but they always do to me when Ive done a little service on them. Ive left it idling for a half an hour now I think Ill go take it for a quick run so the ECU can learn the new sensor readings and adjust what it needs to. rascal808
Hi. No the engine symbol hasnt been on since the lambda probe was replaced a month ago. The engine doesnt misfire... Everything is normal except from this one problem. The fiat workshop manual (by fiat ) states the idle speed is set by the ECU using the TDC sensor when the engine is warm. But it looks like its the same sensor that the ECU uses to display RMP at the dashbord... So it seems like its
Assuming you can get access to the sensor they just unscrew. Make sure you unplug it first. The problem you may have is they tend to rust in to the exhaust system and can be a pig to get out. New one is not a problem all the good motor factors sell them they will just need your registration number to get into the catalogue for your car and select the correct one. AnfielRed118 thanked for this post
hiya i have got 2 weekends both 1.8 engines one is r reg one is t eg both only have the one sensor
My 2.0 20v has 1 sensor aswell do you mean cataclean i used it a few years ago for best results add it to the fuel tank when theres not much in there and leave it standing running so it gets real hot but i added it to my tank when i juiced up and went for a long run-personally i think it worked better running thru constantly then wallop all in one go just like redex great stuff just use it propperly
A quote i found on a similar thread says this- Yes if yours is the later model you will have a pre and post cat lambda . The pre one is on the exhaust manifold and the post one is just below the cat which is the big bit just after the manifold . If you have the CF2 version then there is only 1 lambda sensor. This is located on the downpipe just after it turns 90degrees and goes under the engine where
Originally Posted by jug i doubt the crank sensor will be the cause. i agree that a diagnostic is the best option at this stage. If it feels like its in limp home mode its probably running on a safety map . Probably something like the lambda being loose or the map sensor is now dislodged. Ross
Hi and nice to be here. Thanks for this forum I searched a lot and already found some tips. But back to my rpm... My Golf-90 didnt have basically any electronics...... so I didnt find either the sensor or wiring. Pls check the photo and mark the place where to look for. Does anyone have mareas service manual in web would like to download Attached Thumbnails   __________________ fiat Forum Useful
visit this link below if your marea is 1.6 auto httpwww.italiaauto.comforumviewtopic.phpt1183 or see photo attached 1. Fuel cut off solenoid valve (underneath) 2. Carbon Filter (underneath) 3. lambda sensor harness (in the black plastic cover) 4. Manifold Absolute pressure sensor (MAP) (in the black plastic cover) 5. 5A fuse for injection-ignition system (in the black plastic cover) 6. 20A fuse protecting
Thanks for the reply. I have now bought a new lambda sensor from a fiat dealer and the problem is still the same. Engine starts ok and runs ok until the temperature needle gets up about 14 of the way then engine cuts out. Engine will restart with difficulty and stall again unless the revs are kept above 1500. on tick over the engine will also stall when it is warm and I turn the steering all the way to the right.
Originally Posted by bulldog5046 yeah i would of leaned more towards it being the TDC sensor anyway but Jug tends to know his stuff well i did say lambda crankshaft position sensor and cam sensor were my 3 most likely culprits i dont understand why the CPS would only have an effect when hot thats why i thought lambda dozens of times ive seen the same problem due to a faulty lambda probe but CPS faults
Thanks for the advice I have just undone the mounting bolts for the crank sensor and it is seized into place. I think that it has seen better days and is probably the main source of the problem. I think that it was probably a good idea to replace the lambda sensor anyway. The guy in fiat said that they usually go after about 50000 miles and then fuel consumption goes through the roof. I think that
Originally Posted by jug well i did say lambda crankshaft position sensor and cam sensor were my 3 most likely culprits i dont understand why the CPS would only have an effect when hot thats why i thought lambda dozens of times ive seen the same problem due to a faulty lambda probe but CPS faults usually show up as random cutting out and crap performance due to irregular fueling. i guess it depends
burnell- bang the dash with your fist to get the dial working although a more permanent option is removing the instument panel and cleaning the 2 connectors on the back of it. if your car is always fine the first drive of the day you can be fairly confident the lambda sensor on the exhasut is to blame because the lambda only works once it has warmed up. try disconnecting it and see if that makes a difference. the connector for the lambda is hidden under a small plastic cover in the engine bay located in the center near the windscreen to remove the cover there are two black plastic knobs which need to be turned until loose then pull the cover forwards and locate the connector it has a white wire on one side (well i say wire its a white sheath over 4 wires). disconnect it and see if the problem changes. potty- the fuel pump is in the fuel tank access it by removing the round cover under the boot carpet. what engine have you got do you have any lights on the dash illuminated by temp sender i guess you mean the sensor to measure intake air temp which is located on the inlet manifold . a haynes manual really is the best place to start looking for info you cant own a fiat without one.
personally i highly suspect the lambda the TDC and cam sensors will stop the car running ( i know this from experience). there is a MAP sensor on my marea and the MAF is fine ill order up a lambda
Originally Posted by bulldog5046 personally i highly suspect the lambda the TDC and cam sensors will stop the car running ( i know this from experience). there is a MAP sensor on my marea and the MAF is fine ill order up a lambda Nope if the ecu loses the CAS signal it sets the injectors from sequential to firing all the time. this causes a chattering from the injectors. Its just about audiable. Power
Hi Jug thanks for the reply. OK I just checked the injectors resistance by unplugging the multiplug that feeds the injectors and going from centre pin of the flat 5 pin plug to each injector pin in the plug these all measure 16.6 ohms each or if I put the meter across any 2 of the injector pins (2 in series) I get 33.2 ohms. So going by the info in the Bravoa forum that states they should be above
OK Update time. Serviced the car last weekend and fitted a new exhaust Purchased new Lamdba (NGK which I hope will work) but couldnt fit. Took the car for a run this weekend and its getting worse. So today I ran over to my local auto electrician making sure the car was playing up when I got to him we plugged in the diagnostics and the error was a Fuel Mixture Problem. We looked the the Upper and Lower
Yes lambda checked been reading and Im thinking that it may be down to the tdc sensor. From what i understand the coolant sensor looks after the fast run (choke cycle until the engine is warm). After which the idle is looked after by the tdc sensor. Im assuming that the impulses from the tdc sensor look after both fuel and spark this is my next plan of attack. Sooty plugs Wont idle when warm Misfires
Not much you can do about the tdc sensor. It will be either external near the flywheel low down or internal fitted into the block near the flywheel at the front. Internal gap 0.5mm to 1.5mm internal 0.8 to 1.5 these are not adjustable (officially). Open closed loop is to do with how the lambda affects the fuel supply. In a closed loop the lambda senses oxygen in the exhaust and sends signals to adjust
i dont think your airfilter has anything to do with it or your fuel changes or your lambda . why the airfilter issue has never happened on anyone elses car. i know what you mean about the vents in the wheel arch liner but id be willing to bet a lot of money that it has nothing to do with it. however you should block those holes up once the airbox is removed to stop dirt entering the engine bay. driving
a thread (occasional starter 25-06-2007) where you help somebody else with starting problems and mention the idle speed control actuator. What he was describing sounded similar regarding the revs. If I remember correctly mines doesnt go up high and then come down. When I got it the lambda sensor was goosed and I had to get a new one... and that sensor light (that seems to be on on every older fiat
Hi Jug. Thanks Mate. I changed my e-mail yesterday but forgot to activate it sorry... I had the ISCV tested OK at a fiat workshop in december last year. I will try the air intake temp sensor do you know what kind of sensor it is is it possible to test it using a multimeter Can a bad lambda sensor or a bad fuel injector cause these problems The only problem is low revs 700-800 at idle at cold start.
hi sorry for the late reply i dont check the marea section very often. best thing to do first is check the resistance of all injectors using the multimeter on the injector wiring harness. the wiring harness has a connector at the right hand side fo the fuel rail. use that connector to do your tests. you want at least 13ohms on each injector. if you search the bravoa section youll find more detailed
Originally Posted by daf430 my marea is a 2001 on a y plate. 1.6 engine. averages about 33 to the gallon. done 102000 but really good engine in car. more or less rebuilt front suspension last year for m.o.t. engine light flashing though will try lambada sensors first. Yeah lambda first 33mpg seems a bit thirsty I get 37-39 at the moment with a mix of motorway and town stop start back and forth to work.
With a sudden and noticeable rise in fuel consumption and then couple that with unreliable tickover dying away then Id check out the lambda sensor as one of my first checks. lambda gives the signal for the ECU to fine tune the fuelair mix when engine is at steady state rpm so a sudden huge loss of economy would make it first on the hit list as the ECU wouldnt have a clue and you would tend to run very rich
hiya ppl . my light came on again today so i went to the garage and he read the ecu for errors. the lambda was the only fault on there. so here is my queston. before i change it is it possile for any other sensor having a problem but the lambda was the only one picking it up from what i have read the lambda controls petrol air mixture correct by the way adding redex had no effect. the light did go out on its own when the rad fan cut in outside the garage.