Question about Oldsmobile Alero
OBD code P0128 set then cleared. 1 week and a refueling and the P0128 and P0240 is set.
Posted by Anonymous on
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Posted on Jan 02, 2017
It could all be related.P1537/38 are the intake manifold runner controls are stuck open.They are controlled by vacuum solenoids.The P0171 is bank one of the engine is running lean,usually caused by a vacuum leak, P0420 is catalytic converter efficiency code. The computer monitors the switch rate of the front 02 sensors and compares it to the switch rate of the rear 02 sensors to tell if catalytic converter is doing its job. Now if the front 02 is not switching properly then this will cause this test to fail and set this code.
Look on bottom section of the intake manifold at the back of engine(where tranny bolts up) you should see the vacuum motors there on the intake,these are the control motors for the intake manifold runners.Make sure the vacuum lines are hooked up and lines are not leaking. Also you will see a lever from it to intake make sure they move and are not binding.
Posted on Mar 11, 2009
This code has plagued technicians nationwide. This code is set because the computer is not reading the proper signals from the O2 sensors. This could either be related to faulty sensors or just a weak catalytic converter. There is also other solutions where you can dampen the O2 sensor signal but it's extremely difficult for a do-it-your-selfer to do.
Posted on Sep 03, 2009
The codes are Catalyst System Efficiency Below Threshold (Bank 1)&(Bank 2).
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
A code P0420 may mean that one or more of the following has happened:
Posted on Oct 06, 2009
CODE P0128- THERMOSTAT MALFUNCTION. POSSIBLE CAUSES 1. ECT SENSOR IS OUT OF CALIBRATION. 2. CHECK THE OPERATION OF THE THERMOSTAT IT MAY BE STUCK OPEN.3.INSPECT FOR LOW COOLANT LEVEL OR FOR AN INCORRECT COOLANT MIXTURE.
Posted on Jan 06, 2010
Hello, and welcome to FIxYa.
To erase the check engine light on a 1994 Camry, open the hood, and, in the engine compartment fuse box, remove the blue 15 amp EFI fuse for one minute. This will clear the codes. If you have a hard code; ie a malfunctioning sensor, the light will come right back on.
Thanks for choosing FixYa for assistance.
Posted on Mar 12, 2010
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