Tuesday, 26 June 2001

Code P0100 Mercedes W 168 / A 140

There was a time when my mercedes benz A 140 having a problem :

1. Loose of power
2. Stalling intermittently when car is slowing down or stop, rpm 500 then dropped into stall.

So I went to garage to have star diagnostic, the error code was  P0100, more detail as below :

P0100-001 There is a sporadic fault in component B2/5 (Hot film mass air flow sensor)
P0100-004 B2/5 (Hot film mass air flow sensor) The signal voltage is too low

Get from www.autocodes.com, the code P0100 means mass air flow sensor error.

Possible causes
- Faulty mass air flow sensor
- Intake air leaks
- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor circuit poor electrical connection


Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine stall
- Engine running rough
- Excessive fuel consumption
- Excessive smoke


From above possible cause, my made simple opinion, I thought there was a problem in connection of wire, so I did clean and tightening the plug and ecu cable. the result was gave effect, the power was back but was still not strong enough.

I made another scan diagnostic after that, and the error code was successfully deleted, the rpm was 800 and more. but the air mass voltage was 0.


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