how do you know if one of these aren't working (without a computer)

 

also what symptoms would you have?

you can check them via ecu secondary test i'll try and find the procedure

http://www.ttzd.com/tech/diagnostictech.html

here you go! follow instructions for mode 11

http://www.ttzd.com/tech/diagnostictech.html

here you go! follow instructions for mode 11

 

 

ive done the wire under the dash check and it didn't tell me ;o(

Your Blatz/Datascan should tell you ...

 

Failing that, some common symptoms of poorly O2 sensors are (in no particular order):

 

(a) rich running (ie lots of petrol smell in exhaust and excessively blackend exhaust tips)

(b) rough running under low load (ie going up a hill whilst keeping speed constant)

© hesitation and/or "hopping" when cruising at a steady speed

 

If there is anyone with a ConZult near to you get them to hook it up, check the fault codes and it will show up. Also, in data monitoring mode you'll be able to see the O2 sensors in real-time - they should be switching between rich and lean very quickly at 2k revs. If they don't alternate then one (or both) sensors are duff.

 

HTH

 

Dan