Lambda sensor diagnostic questions

geogan

geogan

Petrolheads
Can anyone here run or read diagnostics with a laptop plugged into the diagnostics port? Car has Ecutek map so does anyone have Deltadash or does it work for this?

Questions:

1. How many Lambda sensors are there on my 03 STI? I heard there are pre & post cat sensors - does this mean there are two of them?

2. How can I check that the Lambda sensor(s) are working correctly? I heard of diagnostic check but how do you do this? Is it a dealer job?

3. Is Lambda another name for o2 sensor or are they different?

3. They appear to be expensive to replace - I've seen cheap genuine low-mileage ones on Ebay. Can I replace/fit these myself if car was up on ramp (if it does turn out to be faulty) or is it a mechanic only job?

4. Would this OBDII diagnostic unit be any good? http://www.scoobyworld.co.uk/catalog/product_info.php?cPath=280&products_id=1831

5. Where's the fuel/air sensor then? Easy to find/replace? Expensive?
 
throw up nct report on emmission readings and someone may be able to help mate. Dont see where your coming from with the boost problems = lambda problem :ponder2:
 
[quote author=garrethk link=topic=32663.msg374452#msg374452 date=1325118836]
throw up nct report on emmission readings and someone may be able to help mate. Dont see where your coming from with the boost problems = lambda problem :ponder2:
[/quote]

To be honest the NCT report is probably obsolete now that I've cleaned the MAF sensor and that has changed the behaviour of the engine already. I just have a niggling feeling that other sensors are old/dirty or not working correctly also - and i would like to ideally replace them with new ones to be sure to be sure - that's why i was asking what there are.

After reading around it appears there is a sensor called a Fuel/Air sensor http://japanparts.com/db/parts_detail.php?NUMBER=00034934&VOLUME=190-049-002&DEALER=1&CAR=3&MIDDLE=1&SMALL=41&MAKER=5&VOLKEY=&SEARCH_DEALER=1&SEARCH_CAR=3&SEARCH_MIDDLE=1&SEARCH_SMALL=41&SEARCH_MAKER=&SEARCH_VOLKEY=&SEARCH_page=&submit.x=18&submit.y=5

Is this the Lambda sensor people are talking about?

There also is an Oxygen assembly - no picture of it though - seems very expensive:
http://japanparts.com/db/partslist.php?dealer=1&car=3&middle=1&small=41
Which one is it on this site?
http://www.partsgeek.com/catalog/2003/subaru/impreza/fuel_injection/oxygen_sensor.html

Can these be fitted by anyone with car on ramp or are they specialist mechanic only jobs? Anyone know how much they are to replace/fit with new ones here in Ireland?

I see someone doing "front" sensor themselves here:

http://www.clubwrx.net/forums/maintenance-service-repair/134287514-diy-front-o2-sensor-02-wrx.html

Again is there more than one?

p.s. this http://japanparts.com/images/ImageFromDB.php?base=1&no=21785 is a picture of the MAF sensor i was talking about - see the little bulb in the picture - check your engine and wipe this clean if it is black!
 
[quote author=BazGF8 link=topic=32663.msg374590#msg374590 date=1325210586]
Lambda really have nothing to do with boost man :thumbsup:
[/quote]

I've removed most of the irrelevant stuff and just concentrated on what I want to know about the various o2/fuel sensors...
 
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