OK all i've done to the car a couple of months ago was; new air flow meter, cap and rotor, spark plug and wires, new intake manifold gasket, new pcv all components and normal routine maintanence of oil and filter change avery 2,500 miles now the check engine is on with tihis codes I feel the engine fine on accelarating everuthings fine to me but the checkengine light on and 5 codes when i took it to Autozone. i've erased them but they come back


P0304
P0137
P0303
P0300
P1310

anyy toughts or ideas what should i get started it if I disconnect the battery it takes long to check engine light to come

 

Disconnecting the battery just resets the CEL and doesn't fix the problems. So once it detects the problems again it comes back on.

From the sticky section:

http://au.geocities.com/ozbrick850/obd2codes.html#obd-2

 

I did disconnect the battery then waited long for the check engine light to come on then took it to autozone i just want a tip what should i check first, i got tools so im a do it myself person person i've done a lot of things on him sou i got no problem fixing the car

 

Oh, coil maybe? The gap in the plugs? What kind of plugs are you using? OEM seem to be what a lot of people reccomend for these cars, but by seeing your list I assume you know what plugs to use. I would say maybe the O2 sensors but you don't have an O2 CEL, unless that last one is, I didn't find it in that list, either way, I don't think an O2 sensor would cause misfires.

 

Those codes are for misfiring randomly and in cylinder 3 and 4. P0137 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes.
Here are links with possible solutions :
http://www.obd-codes.com/p0137
http://www.obd-codes.com/p0300
http://www.obd-codes.com/p0304
http://www.obd-codes.com/p0303
http://www.volvoclub.org.uk/tech/ser...odes-Turbo.pdf

 

I know I put recently new spark plugs and wires, new cap and rotor,oxygen sensor cause the mechanic told me it was bad . i did notice a litlle misfire on idle but ist not that much im gonna check tommorow for vacuum leaks and take it O2 sensors and clean them then reset the light to see wat comes up..