Technical Engine chek light on

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Technical Engine chek light on

adoks

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2001 1.6, Had some very poor running problems, replaced Lambda, and running well, engine check light went out on it's own, but has returned, engine still seems to be running normally, there is an exhaut leak at the join between cat and flexi. Could you give me some advice on what to check. Reluctant to have garage investigate due to cost and lack of trust.
 
Is the lambda sensor near the leaking exhaust? If it is, it would detect it as a lean mixture and increase the fuel into the engine. If your anywhere near Swindon, I could put my new diagnostic reader on the car to see what the problem is for you?
 
Post cat Lambda is upstream of exhaust leak, and reasonably close say about 20cm
Thanks for the offer for diagnosis unfortunately I am up in Scotland.
 
Checked plugs, look OK that is no evidence of over fueling, not really sure about the accuracy of this check but they look normal.

Had aquick look at exhaust leak, not too noisy but water coming out and you can feel exhaust gas coming out, so looks like I need to fix this first.

Any one have any experience of an exhaust leak bringing on the check engine light.

May have to get a fault code reader, any recommendations 2001 1.6 so should be OBD, any advice?
 
THanks for that, just need to ensure that 2001 1.6 is OBD2 compliant, can anyone confirm this
 
Bad news, fiats are not ODB2 supportive.
Good news, if i remember correctly reader u bought supports EODB too :D

written by joske (soemthing)

The Bravo/a and Mareas are not ODBII, they are EODB however they use the universal ODBII connector. Fiat started to fit EODB connectors to cars before the auto legislation changed to make it compulsory for ODB and ODBII all-in-one diagnostic ports to be fitted to new cars (2001 petrols 2004 diesels). You can say they were one of the first. The only down side is that they used there own protocols.

From 95-00

All petrol Bravo/a and Mareas upto 2000 (except the 1.2), have several 3 pin diagnostic connectors located on the car.

All diesel Bravo/a and Mareas upto 2000, have several 3 pin diagnostic connectors located on the car.

2001 onwards

The 1.2, 1.6 and 2.0 Fiat Bravo/a and Mareas from 2001 onwards, have a 16 pin EODB all-in-one diagnostic connector. (not sure about the 1.8, by law it should have but there is no reference to Fiat fitting it to any 1.8 Bravo).

All diesel Bravo/a and Mareas from 2001 onwards, have a 16 pin EODB all-in-one diagnostic connectors.
 
[FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]The OBD II Federal requirements apply to cars sold in the United States from 1996.[/SIZE][/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]EOBD is the European equivalent of the American OBD II standard, which applies to petrol cars sold in Europe from 2001 (and diesel cars 3 years later).
[/SIZE][/FONT]
[FONT=Verdana, Arial, Helvetica, sans-serif][SIZE=-1]For more information on why OBDII tools will only work with 2001 and newer petrol cars in Europe, and not with all UK and European cars from 1996 onwards, please [/SIZE][/FONT]

So if tou buy an interface or reader that is EOBD compatable, will this work on a 2001 1.6 should do right, can anyone confirm this?
 
well someone noted, that eaven with "injector light" it may be EODB :D, dont remember who... but if u have connector (under the dash, near the hood opener - I THINK) it shuld be ....
 
OK, have tke the plunge, have ordered an EOBD interface and software from E-bay arround £30, will let you know how I get on.
 
Engine check light on Obd reset

OK, quick update, cheap EOBD interface from ebay was able to read and reset fault codes which were PO130 (O2 sensor circuit) and PO170 (fuel trim). I think these are faults from my initial problem of faulty Lambda, which I replacaced.
May have fixed the leaking exhaust joint using new crush seal and high temp silicone, Qwikfit had installed a new exh flexi and the exhaust was leaking worse than it was before they fitted it.
So now just need to wait and see if engine check light stays out and if ti passes MOT which is due soon
 
Well, the saga continues check engine light keeps returning with fault code PO130 (Lambda) Lambda was replaced a month ago, so what is happening. can fault code PO130 only be caused by the lambda, or can it be triggered by another fault. Not sure what to do now. Car runs OK, but idle is sometimes erratic and other times stable. Anyone have any ideas.
 
Hi,

You can check here for causes of this problem:

http://www.obd-codes.com/p0130

What software are you using on your scanner? If you use something like ScanXL you can monitor and record the lambda output in real time whilst driving then review it later. You can then see if it's going out of range and that it's alternating depending on the fuel trim values.

It's also worth looking at the freeze frame data. This is a snapshot of relevent PID values when the actual error occurs and brings on the MIL.
 
Thanks for that Synchro, my software is free issue and basic, will look tommorrow if can see logged or freeze frame data, thanks again
 
well look anything that looks out of ordinary(lets say intake air temp +50 while ur freezing outside etc, anything that might not look ok, and then u can remove other sensors, and with pc connected u can see if ur lambda goes correct or not / if changes at all, but just do what u know, dont pick connectors randomly ) gl
 
Well, unfoortunately I my free software does not allow use of freeze frame or data logging. I can see the Lambda voltage, which I tried to monitor this with a passenger whilw driving. Voltage seems statis at 0.9v, until throttle is fully release, then on over run voltage drops to 0.1v. I can not see voltage alternating, but this may be due to the refresh rate of the sofware.

After resetting engine check light it seems to stay out as long as the car is being driven, if switch off and restart, then the light may come on. Idle is sometimes steady and other times very uneven, and can stall.

I am thinking of a possibility of Lamda heater fault, measured resistance at 7.5 ohm so circuit is not open. This lamda sensor is only a nonth old, but everything is pointing to it being faulty. I may have to replace it again unless anyone has any other idea.
 
Voltage seems statis at 0.9v, until throttle is fully release, then on over run voltage drops to 0.1v. I can not see voltage alternating, but this may be due to the refresh rate of the sofware

It could be, but 0.9V represents a very rich mixture. It should drop to 0.1V on overrun as the engine does not require much fuel at this point (It reverts to open loop minimal fuelling mode).

After resetting engine check light it seems to stay out as long as the car is being driven, if switch off and restart, then the light may come on

Some less serious faults are stored as a pending code. If the same fault occurs next time the car is driven, only then the light will come on.

I am thinking of a possibility of Lamda heater fault, measured resistance at 7.5 ohm so circuit is not open. This lamda sensor is only a nonth old, but everything is pointing to it being faulty.

What Lambda sensor did you buy? Some of the cheap or generic ones have different resistance heaters. This itself can be enough to trigger an alarm. Also don't ever measure the resistance of the sensor as this can damage it! Measuring the two heater cables is fine.

If the car detects a sensor fault, the fuelling system drops out of closed loop control and runs open loop.
This generally means the car runs far richer than normal, and therefore mpg drops sharply. It could possible cause poor running too. Is your air filter clean, otherwise it would act like the choke is on and check for any vacuum leaks or split pipes, especially the cam cover breather.
 
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