NTK Lambda sensors L1H1 vs L2H2 vs LHA

[vprtech]

Recently I was involved in the installation of M800 ecu using two lambda channels. I decided to try a pair of NTK LHA (LZA-08-H6) sensors, the same that are sold with the NGK AFX wideband. They did free air calibrate ok, but I found that they did not read accurately against my ECM AFM1000. I swapped them out with a set of Bosch LSU 4.9 sensors from Motec, and all was good.

Looking into this a bit further, it appears that Motec sells or sold the L1H1 (Motec p/n 57007) sensor for use with the hundred series ecus and the PLM . It also appears that the lab grade NTK (7ZB2?) sensor will work, as it is listed by Motec USA . To add to the confusion the L1H1 sensor has been discontinued by NTK, and replaced by the L2H2 sensor (LZA-09-E1) . In total we have four NTK sensors types , the L1H1(discontinued ?), L2H2 (LZA-09-E1), LHA (LZA-08-H6), and the lab grade sensor sold by ECM (7ZB2).

In addition to my AFM1000 wide-band, I have a PLM which I have had for about ten years, and have always used with the Motec Bosch sensor p/n 57004. After using the AFM1000 regularly for about three years, it has been my experience that the NTK sensors are the ones to use, durability wise. I've had to replace many Bosch sensors with my PLM , but only replaced the NTK sensor as a matter of maintenance. Interestingly enough, ECM who make the AFM1000 insist that their widebands will work with any NTK wideband sensor, including the LHA sensor that is sold with the NGK AFX, no calibration changes are necessary. This is why I though the LHA sensor might work with the M800, which it apparently does not.

So my questions are:

1-Does the L2H2 sensor work with Motec correctly, if not, does Motec have stock of the L1H1 sensors?

2-Does the NTK lab grade wideband (7ZB2) work with Motec , I ask because it would be convenient to be able to share the same sensor between my AFM1000 and the PLM. If so, does this sensor share the same calibration with the L1H1 sensor ?

3- Is or would Motec consider adding support for the LHA sensor, the LHA is reasonably priced and readily available from local parts supply houses.

Any thoughts on this are appreciated.

[Scott@FP]

The L2H2 that is known to work is NTK stk # 24300, which should be the same as Motec #57003. The LHA you apparently tried should be NTK stk # 24302. I am not sure if the 24301 is just a different connector than the 24300 or if its a different sensor. The 24300 has the 8 pin Sumitomo (Honda style) connector. It can be found reasonably priced, but not as cheap as the LHA OEM ones.

[stevieturbo]

So is this 24300 you refer to a direct replacement for the L1H1 with the Sumitomo connector as per Honda ?

ive an old wideband in my car that uses this sensor, would be handy to have a spare.

[RossB]

The LZA08 has a pump current of 4mA where the L1H1 and LZA09 have a pump current of 6mA. MoTeC supply the LZA09-E1 under part number 57007. We have chosen to use this sensor as it is backward compatible with the L1H1 which has been used with ourproducts for many years and we have been able to secure a supply arrangement with NTK so that we know they will always be available to us. We do not stocjk the L1H1 sensor any more.

If you want to use your LZA08 with your PLM I would suggest that you perform an air calibration but use the Gain Factor calibration instead of the Equivelent Resistor calibration method as this is likely to give you a better result. THe calibration resistor values used in the LZA08 will be different to what is used in the LZA09.

If you still have a descrepency you can create a custom output table in the PLM to make it output the correct values.

[Scott@FP]

NTK stock # 24300 is the L1H1 replacement (L2H2) with the 8 pin grey Sumitomo connector.