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2008 Saab 9-3 Base 4dr Sedan

2008 Saab 9-3
Trim Info:
Front Wheel Drive, 4 Door Sedan, Compact
19 mpg city / 29 mpg hwy
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April 30, 2011, 11:15 am

AutomotiveForums M

Question: Error Code P0400, P0100 and P0110

I know after diagnose my car its the EGR Valve (P0400), MAP sensor (P0100) and the IAT sensor, is it necessary to replace all three sensors?

May 2, 2011, 4:15 pm

Ron W
Expert Mechanic

Usually when you get multiple codes all of a sudden, there is more to it than just replacing sensors.

For all hard starting or engine performance issues, you should always start with the basics. Make sure the tune up items are done and check the charging and starting systems. The engine must have the basics done in order for it to be able to run correctly. Many things can cause this type of problem, and the simplest sometimes get overlooked.

I would clear the codes after the tune up and see if they reset. If they do then I would start looking at the circuits.

1/1 users found this helpful.

May 4, 2011, 11:46 am

AutomotiveForums M

Hi Ronw,

Thank you very much for your reply, after measurements on the MAP sensor I have replaced the MAP sensor, it was broken, I have cleaned the EGR Valve and cleared the codes with a simple OBDII Scanner from $ 45.
By the way it was a Saab 9-3 2.2 TiD, year 1999, the Saab runs well again and the codes have not reappeared.

Kind Regards,


0/0 users found this helpful.

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