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Re: replace oxygen sensor on 2003 chevy silverado truck
It's not hard to change, kinda like a sparkplug with a wire permenantly attached, if you go to O'reilly's or Autozone they will loan you a special socket to take it off and install the new one, Generally most cars have two one before and one after the catylitic converter, make sure which one the code is telling you is bad. Also a cheap fix, many wrecking yards don't charge but 5 to ten bucks for a used one as opposed to a new one for 60.00 to 100.00, If you don't mind going out and removing it, You take a chance one getting a bad one but, you can always take it back and get another one
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This is a heated oxygen sensor and the computer is detecting that there is a problem with the heater portion not working. And the other code is caused because the heater is not working.
This could be a fuse, wiring, a connector with a poor connection, or the heater in the oxygen sensor (replace oxygen sensor in that case).
Generally oxygen sensors should be changed every 60,000 miles as a regular maintenance item. And when I replace mine, I get better gas mileage (also my engine is more lively). So I see this as a money saving thing myself.
But just about everyone I know will REFUSE to replace their oxygen sensors for some reason???
Anyway information for troubleshooting and/or replacing this would probably be in an aftermarket repair manual for your vehicle (auto parts store). But this information would for sure be in a Factory Service Manual set for your vehicle which you can order from your dealer.
Harness or connectors (The sensor circuit is open or shorted) - Front Heated oxygen sensor (Bank 1) may be faulty
Replacing the O2 Sensor 1 usually takes care of the problem
front heated oxygen sensor (or sensor 1) is placed into the exhaust
manifold. It detects the amount of oxygen in the exhaust gas compared to
the outside air. The heated oxygen sensor 1 has a closed-end tube made
of ceramic zirconia. The zirconia generates voltage from approximately
1V in richer conditions to 0V in leaner conditions. The heated oxygen
sensor 1 signal is sent to the ECM. The ECM
adjusts the injection pulse duration to achieve the ideal air-fuel
ratio. The ideal air-fuel ratio occurs near the radical change from 1V
When is the code detected?
Current amperage in the front heated oxygen sensor heater circuit is
out of the normal range. (An improper voltage drop signal is sent to ECM through the front heated oxygen sensor heat a four thumbs up would be helpful if this fixed your problem thanks have a nice day
P0420 is a catalytic convertor efficiency below threshold, basically the convertor is not working to specs. As long as you are under 80,000 miles the convertor is covered under federal warranty for 8years/80K miles at the dealer. If its not covered, you need Bank 1 Catalytic convertor replaced possibly with Oxygen sensors.
The most likely solution is to preform a crank relearn this must be done with a good scan tool such as snap on modis/solus OTC genisis or GM tech 2 a cheap scan tool CAN NOT preform this function. A crank relearn will renew the relationship with the computer and crank position sensor
hi, the problem you are having sounds to me like the oxygen sensor " or lambda sensor for its real name" has failed and needs replacing the reason it points towards this being the fault is that the oxygen sensor only starts working once the engine reaches a certain temp so if your car runs perfect from cold but plays up when warm then this is a good indication that the oxygen sensor needs replacing.
Let me know how you get on or if you need further assistance ok