Question about 1996 Mercedes-Benz C-Class

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97 C230 ODB2 P400 code, EGR System where should I start

The check engine light is on. When I pull the codes I get a P400 fault and a P460 pending code. The code only says "EGR System" I was wondering where to start looking for the problem.

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Check your IAC Idle Air control valve. It is located on the top right back of the motor behind the air intake. You can also remove the EGR valve and check to see that the piston is not gummed up. If it is then replace that. Also look for simple cracks on the boots or hoses sometimes that will cause this to happen. If this helped please rate. Thank you

Posted on Feb 12, 2009

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My check engine light comes on and stays for awhile then goes off. It will stay off for about a month then come back on, I need to know the location of the egr valve on a 97 nissen sentra.


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I have a 2001 Nissan Altima & my Service Engine Soon lite comes on. When checked these are the error code's; P1441 & P400. So far I put in a new EGR but still the lite goes back on. Please help...


On the nissan is there a swirl chamber code that comes on also, If it does then its truly a EGR code, but if the code is 1441 and 400 then its not the EGR, 400 is the EGR system not the EGR you r fix and solution is to solve P1441 the 400 is for function only. the failure is 1441 here is the definition Fuel filler cap, replace your gas cap and if its the type that click as you close the cap make sure it does Leave the EGR alone

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Where is the plug in a 1994 toyota camry to hook up the diagnostic code box


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All models except the 1MZ-FE engine is equipped with OBD I till 1995.
  1. Make sure the battery voltage is at least 11 volts.
  2. Make sure the throttle valve is fully closed.
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  4. The engine should be at normal operating temperature.
  5. Using a jumper wire, connect terminals TE1 and E1 of the Data Link Connector 1 (DLC1).
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2001 Honda Odyssey with a TCS and check Engin light on


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1 Answer

Code P400


Code P400 is an EGR (exhaust gas recirculation) valve malfunction.

These cars are known for the EGR ports getting clogged.

The valves themselves rarely fail.

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