Lambda sensor replacement
Discussion
Hi All,
My lambda (number 2) seems to have failed, it is switching slow and has a tendency to either stay high and go low for longer periods.
As a result the AFR gives an error and the adaptives on bank 2 are very low sometime below -35%.
All of this in my Tamora out of 2003.
So looking for a replacement lambda sensor, as the NTK OZA341-NB1 are not available anymore does any one have an alternative part number?
After some searching and comparing, the OZA836-EE11 could be the modern replacement for it, but has anyone some experience to share on this topic, as these sensors are not very cheap and returning after use is also not an option if they do not work.
regards Michiel
My lambda (number 2) seems to have failed, it is switching slow and has a tendency to either stay high and go low for longer periods.
As a result the AFR gives an error and the adaptives on bank 2 are very low sometime below -35%.
All of this in my Tamora out of 2003.
So looking for a replacement lambda sensor, as the NTK OZA341-NB1 are not available anymore does any one have an alternative part number?
After some searching and comparing, the OZA836-EE11 could be the modern replacement for it, but has anyone some experience to share on this topic, as these sensors are not very cheap and returning after use is also not an option if they do not work.
regards Michiel
Personally, I’d bite the bullet and replace both sensors.
The 4-wire replacements address an issue that the sensor relies on a good earth….rather than relying on using the ground at the ECU, as the earlier 3 wire sensors did.
The 4 wire editions are usually earthed by going directly to the block.
Nick
The 4-wire replacements address an issue that the sensor relies on a good earth….rather than relying on using the ground at the ECU, as the earlier 3 wire sensors did.
The 4 wire editions are usually earthed by going directly to the block.
Nick
Can I make a suggestion? Try swapping the sensors around to see if the sluggish behaviour follows the suspect sensor or stays with that bank.
When your adaptives are that far out (-35%) the lambda will remain stuck at one value while trying to compensate, then when it's either added or subtracted so much fuel it will go hard the other way, looking like a sluggish response. It might be worth resetting the adaptives and then setting up the throttle pots etc to get a good baseline. Then go for a drive and log the output to see what's happening.
Might be nothing more than needing a good tune-up and save you money on un-needed replacement sensors. Just a thought.
When your adaptives are that far out (-35%) the lambda will remain stuck at one value while trying to compensate, then when it's either added or subtracted so much fuel it will go hard the other way, looking like a sluggish response. It might be worth resetting the adaptives and then setting up the throttle pots etc to get a good baseline. Then go for a drive and log the output to see what's happening.
Might be nothing more than needing a good tune-up and save you money on un-needed replacement sensors. Just a thought.
Thanks for all the thoughts.
I switched them around, and the behavior travels along so lambda's are the main suspect.
also reset the adaptives, before the verdict was made that it probably is the lambda sensor, i also checked the throttle alignment/balance of all six throttle bodies, double checked the throttle positioning was correct, reset those as well and checked for airleaks.
Which led me to believe the only suspect left is the lambda's or the fuel pressure is to high but that would effect both banks.
the switching of both lambda's is slow but the number two sensor is really sluggish.
I went to my local parts store, they had the NTK OZA341-NB1 (partnumber on the old lambda's) in their catalog, but not available for order.
I have no record of the lambda's ever being changed so they seem to be the originals.
But their system suggested another one that should be compatible, so going to try those.
will keep you all posted on the progress.
I switched them around, and the behavior travels along so lambda's are the main suspect.
also reset the adaptives, before the verdict was made that it probably is the lambda sensor, i also checked the throttle alignment/balance of all six throttle bodies, double checked the throttle positioning was correct, reset those as well and checked for airleaks.
Which led me to believe the only suspect left is the lambda's or the fuel pressure is to high but that would effect both banks.
the switching of both lambda's is slow but the number two sensor is really sluggish.
I went to my local parts store, they had the NTK OZA341-NB1 (partnumber on the old lambda's) in their catalog, but not available for order.
I have no record of the lambda's ever being changed so they seem to be the originals.
But their system suggested another one that should be compatible, so going to try those.
will keep you all posted on the progress.
That's a very comprehensive check. If nothing else - it gives you more confidence in suspecting the lambda. I can't help any with a replacement - mines a V8 and 3 wire, but I have found that when AFR's and adaptives are out - it's usually something further up the chain, which is why I suggested a check.
Good luck with it. It'll be all sorted for summer
Good luck with it. It'll be all sorted for summer
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