Help diagnosing P0170-23 on 1998 ML320
Thread Starter
Junior Member
Joined: Mar 2019
Posts: 47
Likes: 7
From: San Diego
2010 C300 sport 4Matic, 1999 ml320
Help diagnosing P0170-23 on 1998 ML320
I'm trying to smog my 1998 ML320, which is throwing P0170-23 code. I ran some tests with HHTWIN.
The MAF is a Bosch that is only a couple years old. I have just cleaned it. It was throwing other codes and I changed the egr valve and everything else went away.
This stood out as possibly relevant.
O2 Control upstream TWC
Right: 24%
Left: 0%
O2 sensor voltage upstream
Right: 304 mV
Left: 846 mV
What should I check next? Are there any other test results from HHTWIN that would be helpful?
The MAF is a Bosch that is only a couple years old. I have just cleaned it. It was throwing other codes and I changed the egr valve and everything else went away.
This stood out as possibly relevant.
O2 Control upstream TWC
Right: 24%
Left: 0%
O2 sensor voltage upstream
Right: 304 mV
Left: 846 mV
What should I check next? Are there any other test results from HHTWIN that would be helpful?
