97 Monte Computer Codes- Where R They?

[LazerDKA]

OK, I took my car to Autozone to get the codes. The guy hooked up the reader, turned the key, and it read 2 codes, both were EVP Emission Control System Malfunction codes, and if I read it right they were 0404 and 0440 but he said they both read 0404. Anywhere I can find these codes listed as well as the 7 or 8-step method of confirming and correcting the problem? Also, how do you reset the computer once you've made the repairs so the light goes off?

[maxwedge]

Subscription to Alldata.com. online repair and diagnostic manuals.

[GVAR]

PO121 Throttle/Petal Position Sensor/Switch A Circuit Range/Performance Problem
PO128 can't find anything for this code
PO130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
PO131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
PO132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
PO133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
PO134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
PO137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
PO138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
PO171 System too Lean (Bank 1)
PO172 System too Rich (Bank 1)
PO300 Random/Multiple Cylinder Misfire Detected
PO325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
PO327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
PO332 Knock Sensor 2 Circuit Low Input (Bank 2)

cleared the codes, rescanned and came up with........

PO116 Engine Coolant Temperature Circuit Range/Performance Problem
PO125 Insufficient Coolant Temperature for Closed Loop Fuel Control
PO128 still can't find anything for this code
PO135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
PO141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
PO171 System too Lean (Bank 1)
PO172 System too Rich (Bank 1)
PO300 Random/Multiple Cylinder Misfire Detected
PO325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
PO327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
PO332 Knock Sensor 2 Circuit Low Input (Bank 2)
PO440 Evaporative Emission Control System Malfunction
PO442 Evaporative Emission Control System Leak Detected (small leak)
PO446 Evaporative Emission Control System Vent Control Circuit Malfunction
PO730 Incorrect Gear Ratio
P1189 something to do with air- fuel mixture

[GVAR]

From the codes it looks like it may have been as simple as your gas cap was not put on tightly after refueling. If this was the problem tighten your gas cap and the light should go off by the next tank full. Hope that helps

[Carwhiz]

Evap codes are most commonly the gas cap, either the cap is too tight - no air is getting through, or not tight enough. If you drive country dusty roads, take the cap off and soak it in dawn, a trick i learned from my gm dealer. However, there are other problems that can cause an Evap code......vacuum leak or a blockage going to the purge canister.

[maxwedge]

The cap cannot be too tight, the tank is sealed and purged/vented as commanded by the pcm, no such thing as the cap not letting air in.

[abess04]

Hi guys my Check Engine Light is on and I know the code. I did a search and found this forum. The code is PO441 . I tried the gas cap thing and it is still on. I replaced the gas cap no change. Does anyone know what else it could be. I have The 96 Z34
I did notice that I am adding coolent more than usual. But can not find a leak under the car. Could it be a gasket leak of some kind. I appriciate the help guys.
Thanks

[growe58]

Originally Posted by abess04

Hi guys my Check Engine Light is on and I know the code. I did a search and found this forum. The code is PO441 . I tried the gas cap thing and it is still on. I replaced the gas cap no change. Does anyone know what else it could be. I have The 96 Z34
I did notice that I am adding coolent more than usual. But can not find a leak under the car. Could it be a gasket leak of some kind. I appriciate the help guys.
Thanks

If you're losing coolant and there is no external evidence, get the car to a shop immediately! These engines are (in)famous for leaking intake manifold gaskets (and blown head gaskets) which allow the coolant to get into the oil. The oil loses its lubricity causing the engine to quickly self destruct. Catch it now while it's "only" $500 before it becomes $3000.