firechicken99

iTrader: (7)

Recently as the weather started to get nicer my 99 T/A threw a P0171- System too lean, Bank 1. anyone know why this happens? and if theres anything i can do to try and fix it. after driving around a few days the SES light went off on its own but then when i scanned the pcm it still showed the code. any ideas?

Splitz

iTrader: (1)

i had the same problem in my '98 Saturn, everytime it rained or got REALLY cold out, it would do it, but the light would always go out and never come back on.

I say let it go, don't replace anything just yet, when it happens during dry weather you might want to investigate further.

firechicken99

iTrader: (7)

Thats whats goin on. The Weather out here got REALLY nice for a few days and it threw the code outta nowhere. now like i said the SES went away, but when hook up the scanner it still reads teh code even though theres no SES light. anyone know wut this code specifically means is goin on????


up!!!!!111

pcgamer4life

iTrader: (2)

o2 sensor perrhaps

LS1_TA_2002

Your O2 sensor is what tells the PCM to turn your MIL on for this particular code.

Assuming your O2 sensor is working properly, and it is sensing more oxygen than it should, there are several common (I use this term loosely) areas to look at.
1.Minor intake leak on the driver's side (since bank 1 is on driver's side).
2.Exhaust system leak on driver's side at or upstream of the O2 sensor.
3.AIR system check valve on, you guessed it, the driver's side.

If your sensor is not working correctly it may well be sending a bogus 'LEAN' signal to the PCM in which case you would have to replace the sensor.

Most important thing to remember is these are my Cali-Certified Smog Tech .02 and there are many more possibilites in between what I have just mentioned. Good luck.