I just scanned my car & got the following codes.

Code 48 mass air flow system failure
Code 64 right o2 sensor lean
Code 34 map sensor low

I assume I need to replace the MAF sensor so solve code 48, right?

Code 64 has been there for a few months. The o2 sensor is less than 10,000 miles old too

Code 34 has me puzzled because the MAp sensor is brand new!

What do you guys make of this mess?

 

You don't give any info on what problems you have. You might want to reset the pcm and then see what codes come back (are actually active).

 

See this thread
http://web.camaross.com/forums/showt...hreadid=220565

The SES light is on non stop. I have reset the PCM 3 or 4 times and these same codes appear.

Car runs fine except for not wanting to start sometimes.

 

If you already had a thread going, why start a new one and then not give any reference to it? It's pretty hard to help without all the info.

Sounds like you need to go over the electrical with a fine tooth comb.

 

Sorry.

Shouldn't a new MAF sensor cure it though? I just I am just hoping.

No ideas on the MAP sensor code? My MAP sensor is new. Maybe I should put the old one back in and see what happens.

 

No sensor is going to work if the electrical system is messed up. Don't replace an expensive sensor without troubleshooting.

 

Very often when several codes come up for an unexplained reason, it points to a voltage problem. Like a bad connection, bad battery or possibly alternator.

In your previous thread you mentioned it won't turn over. Do you mean it won't crank or do you mean it cranks but does not start?

 

It cranks, but won't start. It only does the not starting stuff once in a while like every 2-3 weeks or so.

The battery is good.

 

u should have about 1.0v-2.0v at idle on the MAP sensor.

with key on engine off, your MAP should be at 4.5v +

does all this check ok?

 

I just checked the MAF sensor plug and 1 prong was bent so it was not even plugged in. I bent it back and now the SES light is gone. I reset the codes. We'll see what, if anything, comes back

I don't know what volts the MAP is at. I'll see if I can find that in Freescan.

Would this MAF sensor plug thing be why it does not start sometimes?

I still want to know why it does that

 

MAP volts is 1.24

 

at idle correct?

 

Yes.

 

The MAF & MAP codes are gone.

I still have that right o2 sensor lean code, though.
I don't understand how that o2 is already shot when it has less than 10,000 miles on it.

I also replaced the fuel pump relay just to be safe. Hopefully some or all of that fixes the not starting problem

 

Just because the code says the O2 sensor is readking "lean" doesn't mean that there is a problem with the sensor. It might acutally be running lean.... large vacuum leak, low fuel pressure.... or it might be a "false" lean.... exhaust leak before the O2 sensor, misfires, etc.

Since you have posted scan data elsewhere, why not use your scanner to look at the long term fuel corrections in as many of the 16 operating "cells" as you can. Somewhere in there, it is likely you have a cell that is maxed out at 160, and still isn't adding enough fuel to correct what the PCM "thinks" is a lean condition.

You also need to look at the long term corrections for both banks... if only one bank is running lean, it tells you its a problem that only affects that side. If both banks are running lean, its a problem that is affecting both sides.