The catalytic converter, as you might know, is a government-mandated device in the Buick Encore's engine that converts toxic gases & pollutants into less-toxic chemicals by means of extreme heat & multiple stages of chemical processing. This code basically means that the engine's O2 sensors associated with your Buick Encore's Catalytic Converter have informed the electronic control unit (ECU) that the catalytic converter isn't doing its job well enough or perhaps at all. What does OBD code P0420 mean on a Buick Encore? So if it is clear under the filter try swapping the battery with a known good one to see if this clears up your problem.OBD Code P0420 is an extremely common indicator of an issue with the operating efficiency of your Buick Encore's catalytic converter, so it's letting you know by flipping on the check engine light (hopefully before you fail an emissions test). If at idle when the alternator cuts out because the engine is turning too slow and you happen to have a weak cell and voltage drops to 10.25 Volts then all **** breaks loose. A failing but yet still good battery will cause all kinds of gremlins because the sensors in these vehicle need regulated 11 volts. Cabin air filter has zero to no effect on the MAF sensorĪn other little demon with these vehicles is the battery. So if it is clear under the filter try swapping the battery with a known good one to see if this clears up your problem. If at idle when the alternator cuts out because the engine is turning too slow and you happen to have a weak cell and voltage drops to 10.25 Volts then all həll breaks loose. Missing, restricted, or leaking exhaust components-Refer to Symptoms - EngineĪn other little demon with these vehicles is the battery. Any snow or ice buildup, in cold climatesĩ. Vacuum leaks at the intake manifold, MAP sensor, and throttle bodyĨ. Splits, kinks, leaks, or improper connections at the vacuum hosesĦ. Any damaged, improperly installed, collapsed, or restricted componentsĥ. Verify the integrity of the entire air induction system by verifying that none of the followingġ. THROTTLE BODY AIR FLOW PERFORMANCE/INTAKE AIR FLOW SYSTEM If it was the MAF sensor you'd get a P0101 or P0102ĭIAGNOSTIC INFORMATION AND PROCEDURES >P1101: Sometimes they eat the bottom out of the filter and then you get the opposite, too much air flow, but this rarely puts out a code. Mjbjr25You must have meant the intake air filter!ĭJDernDid you check the water trap under the air filter? Did you remove the air filter? Sometimes rodents get in there and build a nest and starve the air going through the air filter which in turn starves the mass air flow sensor. I have tried checking for an Air Leak around the hoses and intake with Carb cleaner, but that yielded no results as no change in engine idle happened. During driving the Fuel trim remains at zero or negative. I have connected a ZUS OBD reader to monitor in real time and found that the Check Engine P1101 illuminates when the Short and / or Long term Fuel Trim climbs at idle and reaches around 35. At times the engine would briefly go into a rough idle and reset, but the light will come on. After researching numerous threads, I checked and cleaned the MAF sensor, checked and tightened all intake hoses, then ordered and replaced the Purge valve, still no fix, replaced the Valve cover with PVC valve and cleaned all electrical connectors including the wire harness. For several months now I have been getting a check engine light with code P1101 come up (MAF out of self test range). I have a 2017 LTZ Trax with around 49,000 miles. Hi all, searched the forums but couldnt find specifics on this issue.
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