Check Engine Light

[Simon1]

Hi Folks. I have a 1998 BMW 328i (E-36). I have had a check engine light for the longest time, and it fails N.J. inspection because of this. The trouble code is, from what I can ascertain is: P0240. Below is a summary of the result from DMV:

Primary Emission Test Performed - FAIL

Bulb Check: PASS
Check Engine Light: Fail
OBD Connector: PASS
OBD Communications: PASS
MIL Command Status: FAIL
Overall Readiness Result: FAIL

OBD SYSTEM - READINESS STATUS


Engine Misfire - Ready
Fuel System - Ready
Comprehensive Component - Ready
Catalytic Converters - Not Ready
Heated Catalytic Convertoers - Unsupported
Evaporative System - Ready
Secondary Air Injection - Not Ready
A/C Refrigerant - Unsupported
Oxygen Sensors - Not Ready
Oxygen Sensors - Heaters - Not Ready
LGR Systems - Unsupported

OBD SYSTEM - DIAGNOSTIC TROUBLE CODE(S) PRESENT

Total # of codes: 1 Individual Code(s) Present P0240 or P0340 ( I cannot ascertain, as the inspector kind of blurred out the trouble code)

SECONDARY EMISSIONS TEST(S) PERFORMED:

Gads Cap: PASS
Tampering: PASS
Visible smoke: PASS
Liquid Leak: PASS
Indicator Light: FAIL
Misc. Emissions: PASS

So, I replaced the Cam Position Sensor to eliminate it as a causative action. The engine has 225,000 miles on it, but if you place a glass of water on the valve cover at idle, the engine runs smooth as glass. I perform all of my own service on this vehicle, and it runs as strong as ever, albeit the "check engine" light. I am leaning towards an EWCM issue. I have tested the Cam Position Sensor, and am drawing the required 5. 2 volts. Then I place an "earth ground to it, and it drops down to negligible levels as indicated it should. Scratching my head.... Any ideas before I replace the ECM???

Thanks brothers....

Rondo

[328 Power 04]

Put a good brand name sensor in there.
It must be original BMW or Siemens/VDO/Bosch.

Aftermarket ones fail again and again.


Also, if you can, read BMW manufacturer codes instead of the vague OBD codes, it often helps. Your case may be simple enough. Put a quality sensor in there first.