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code p0171 refers to system to lean bank 1==causes intake /exhaust leak--AIR system--MAP/MAF sensor--fuel pressure/pump--injectors--HO2s Have a fuel pressure test done on the fuel manifold to check for blocked filter/faulty pump/fuel pressure regulator faults code p0174 refers to system to lean bank 2 --same causes including hose connection/s code p0420 refers to catalytic converter system -bank 1 efficiency below threshold==causes catalytic converter--wiring--HO23. Check the cat converter is not cracked inside and the oxygen sensor is working.
DTC P0420 - Catalyst System Efficiency Below Threshold (Bank 1) 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.
You will likely not notice any drivability problems, although there may be symptoms.
A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for An oxygen sensor is not reading (functioning) properly The engine coolant temperature sensor is not working properly Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe ******** spark timing The oxygen sensors in front and behind the converter are reporting too similar of readings
Some suggested steps for troubleshooting a P0420 error code include: - Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required. - Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady). - Inspect the downstream heated oxygen sensor (HO2), replace if necessary - Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
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DESCRIPTION The Oxygen Sensors (O2S) are attached to, and protrude into the vehicle exhaust system. Depending on the engine or emission package, the vehicle may use a total of either 2 or 4 sensors.
On this emissions package, 4 sensors are used: 2 upstream (referred to as 1/1 and 2/1) and 2 downstream (referred to as 1/2 and 2/2). With this emission package, the right upstream sensor (2/1) is located in the right exhaust downpipe just before the mini-catalytic convertor. The left upstream sensor (1/1) is located in the left exhaust downpipe just before the mini-catalytic convertor. The right downstream sensor (2/2) is located in the right exhaust downpipe just after the mini-catalytic convertor, and before the main catalytic convertor. The left downstream sensor (1/2) is located in the left exhaust downpipe just after the mini-catalytic convertor, and before the main catalytic convertor.
Left and right are distinguished by sitting in the vehicle, not looking at the vehicle from the front
CODE PO102 IS MAF SENSOR CIRCUIT LOW FREQUENCY CONDITIONS / CODE PO420 IS CATALYST SYSTEM LOW EFFICIENCY BANK 1 CONDITIONS. BAD MASS AIR FLOW SENSOR WILL AFFECT CONTAMINATE DAMAGE CATALYTIC CONVERTER DUE TO RICH EXHAUST EMISSIONS.
Code P0422 deals with the catalytic converter. The pollution control / emissions system compares the oxygen sensor reading from the front of the converter, then compared it to the reading for the rear oxygen sensor and thus measures the health of the catalytic converter. Perhaps the sensor is starting to go, but likely it just means that your catalytic converter has to be replaced for proper engine function and to minimize the bad emissions from the tailpipe.
Catalytic converters are often welded right into the tail pipe system and requires a welder and the knowledge of how use it. Likely a muffler shop or your local mechanic can replace the catalytic converter.
You will not seriously harm your motor by running it with this condition for a short period of time, but you should deal with the issue before too long.
p0108 map curcuit high input, p0128 coolant temperature below thermstat regulating tempurature, p0341 is camshaft position sensor A-bank 1 ckt range/performance, p0401 is exhaust gas recirculation, insufficiant flow detected, p0420 is catalyst system efficiency below threshold, p1480 is manufacturer control auxilary emission controls, p1481 is same as p1480.
How do you know the bank 1 sensor 1o2 sensor is bad sometimes other components will give an o2 sensor code what was the fault code? Bank one means closest to the number one cylinder sensor one means before the cat, What size motor, litre size
YEAH MAN I KNOW WHAT YOU ME, THOSE DARN COMPUTER ARE WAY TO SMART.. THERES NOTHING WRONG, BUT YOU CAN TAKE THE TRUCK TO A GM DEALER AND THEY CAN FLASH THE COMPTUER, BUT THE ONLY DOWNFALL IS THAT THE CHECK ENGINE LIGHT WILL NEVER WORK AGAIN.. SO ITS YOUR CALL..GOOD LUCK KEITH..