Oxygen sensors?

[noogieman]

I wonder what kind of oxygen sensors there is on 1998 - 2000 eüro market W202 C43 AMG?
Do we have wide band oxygen sensors or narrow band oxygen sensors on our W202 C43 AMG?

Eüro/Djapan/Australija market C43 AMG had only 2x oxygen sensors without CEL option, where the US market cars had 4x oxygen sensors with CEL in cluster.
I believe that the MY2000 Eüro/Japan/Australija market C43's had CEL in cluster?
Correct me if I'm wrong?

Wide band oxygen sensores do they measure A/F ratio in a wider scale gathering more information from exhaust fumes?

Narrow band oxygen sensors do they measure A/F ratio in a smaller scale covering less information?

Thanks

 

[PobodY]

I would have thought they were narrow-band. Why fit the more expensive parts if they're not required?

That's not to say it's impossible, but a narrow-band will do unless you're trying to continuously monitor the AFR readings (e.g. tuning).

Essentially narrow-band has two states; lean and rich. - If it switches between the two states fairly regularly, that's stoichiometric. If it spends more time on rich (or lean) there's a problem with the fuelling. Because it's a digital signal it's easy for the ECU to understand.

A wideband will give you a number for everything between rich and lean; it tends to be an analogue signal, so it's added complexity (or possibly an added ADC) for the ECU to interpret it.

If the fuelling is unlikely to be miles out, a narrow-band is usually enough to keep it in-spec.

Often the second lambda sensor is just to check that the catalytic convertor is doing its job.

 

[PobodY]

It's also worth noting that a probe in or near the catalytic convertor might just be for temperature. - Older designs could get quite hot, so a light would come on to let the driver know they could set fire to something like dry grass.

On my Nissan the temperature probe isn't even connected to the ECU; just the instrument cluster... and since there's no cat either, it doesn't ever come on.

 

[noogieman]

thanx for your info.

I was browsing Fleabay and saw some 52mm gauges for narrow band VS wide band monitoring.

people who mod their car with HD turbos or Super Chargers should they buy the wide band gauge for more accurate readings of AFR?

you guys who did the stock engine swap from 4.3L to 5.4L on your C43, did any of you install this gauge monitoring AFR if you run your new 5.4L engine with stock C43 ECU?

according to other people, running the 5.4L engine with stock C43 ECU without doing a re-flash to E55 software will cause the 5.4L engine to run a bit lean, but will NOT be harmful to cats.

 

[Tuercas viejas]

I would have thought they were narrow-band. Why fit the more expensive parts if they're not required?

That's not to say it's impossible, but a narrow-band will do unless you're trying to continuously monitor the AFR readings (e.g. tuning).

Essentially narrow-band has two states; lean and rich. - If it switches between the two states fairly regularly, that's stoichiometric. If it spends more time on rich (or lean) there's a problem with the fuelling. Because it's a digital signal it's easy for the ECU to understand.

A wideband will give you a number for everything between rich and lean; it tends to be an analogue signal, so it's added complexity (or possibly an added ADC) for the ECU to interpret it.

If the fuelling is unlikely to be miles out, a narrow-band is usually enough to keep it in-spec.

Often the second lambda sensor is just to check that the catalytic convertor is doing its job.

And to do a final trim to the fueling figures remember.
Tuercas Viejas

 

[PobodY]

My GTiR has a wideband to keep an eye on the fuelling with added boost, but the ECU is only taking the narrowband reading from the turbo elbow.

To further muddy the water, titania and zirconia lambda sensors work in different ways (and are not cross-compatible).