Question Asked: Why did 1998 ML320 fail emissions test twice?
October 04, 2010, 10:01 AM
On 8-21-10 my SUV failed the first emissions test. It gave codes P0100 Mass Air Flow Circuit Malf and P0400 Exhaust Gas Recirculation Flow Malf. On 9-13-10 Cleaned EGR valve and ports. On 9-24-10 replaced Mass Air Flow Sensor. 9-24-10 check engine light came back on, code P0400 EGR showed up again.
Problem Reported: Engine Performance Problems Due to Crankshaft Position Sensor Failure
September 15, 2010, 10:08 PM
<p>The <a class="ct_glossary tooltip" href="/crankshaft-position-sensor"><span class="ct_glossary tooltip">crankshaft position sensor</span></a> may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool off, but it may run roughly or have poor performance.</p>