P0303 and 05 auto-clear?
Veteran
Joined: Jun 2017
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Glad to see it seems the misfire code is fixed, keep us updated on that. Also, what year is the truck? A quick google says TX allows 2 unready monitors on 2000 and older, and 1 unready on 2001+.
https://www.dps.texas.gov/rsd/vi/Misc/faq/ready_not.htm
So if heated O2 sets to ready, I would suggest going ahead and hitting emissions and get it done.
https://www.dps.texas.gov/rsd/vi/Misc/faq/ready_not.htm
So if heated O2 sets to ready, I would suggest going ahead and hitting emissions and get it done.
Last edited by Skreelink; Nov 17, 2017 at 06:18 PM.
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Legend
Joined: Feb 2005
Posts: 8,058
Likes: 183
From: Fort Worth, TX
it's an 01.
SOO close today, 1 not ready...until EVAP decided to throw me a 442 and 455 code. Think it's my old gas cap (seal is bad), stuck a new one on there, filled it up, and reset the counters.
Sitting with 2 not ready right now, EVAP (because full tank, on purpose) and O2 heater. I'm hoping that O2 heater will reset overnight with the cold start in the morning. The FSM doesn't say anything about when that monitor actually runs.
SOO close today, 1 not ready...until EVAP decided to throw me a 442 and 455 code. Think it's my old gas cap (seal is bad), stuck a new one on there, filled it up, and reset the counters.
Sitting with 2 not ready right now, EVAP (because full tank, on purpose) and O2 heater. I'm hoping that O2 heater will reset overnight with the cold start in the morning. The FSM doesn't say anything about when that monitor actually runs.
OXYGEN SENSOR HEATER MONITOR
If there is an oxygen sensor (O2S) shorted to voltage DTC, as well as a O2S heater DTC, the O2S fault MUST be repaired first. Before checking the O2S fault, verify that the heater circuit is operating correctly.
Effective control of exhaust emissions is achieved by an oxygen feedback system. The most important element of the feedback system is the O2S. The O2S is located in the exhaust path. Once it reaches operating temperature 300° to 350°C (572 ° to 662°F), the sensor generates a voltage that is inversely proportional to the amount of oxygen in the exhaust. The information obtained by the sensor is used to calcu- late the fuel injector pulse width. This maintains a 14.7 to 1 Air Fuel (A/F) ratio. At this mixture ratio, the catalyst works best to remove hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxide (NOx) from the exhaust.
The voltage readings taken from the O2S sensor are very temperature sensitive. The readings are not accurate below 300°C. Heating of the O2S sensor is done to allow the engine controller to shift to closed loop control as soon as possible. The heating element used to heat the O2S sensor must be tested to ensure that it is heating the sensor properly.
The O2S sensor circuit is monitored for a drop in voltage. The sensor output is used to test the heater by isolating the effect of the heater element on the O2S sensor output voltage from the other effects.
If there is an oxygen sensor (O2S) shorted to voltage DTC, as well as a O2S heater DTC, the O2S fault MUST be repaired first. Before checking the O2S fault, verify that the heater circuit is operating correctly.
Effective control of exhaust emissions is achieved by an oxygen feedback system. The most important element of the feedback system is the O2S. The O2S is located in the exhaust path. Once it reaches operating temperature 300° to 350°C (572 ° to 662°F), the sensor generates a voltage that is inversely proportional to the amount of oxygen in the exhaust. The information obtained by the sensor is used to calcu- late the fuel injector pulse width. This maintains a 14.7 to 1 Air Fuel (A/F) ratio. At this mixture ratio, the catalyst works best to remove hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxide (NOx) from the exhaust.
The voltage readings taken from the O2S sensor are very temperature sensitive. The readings are not accurate below 300°C. Heating of the O2S sensor is done to allow the engine controller to shift to closed loop control as soon as possible. The heating element used to heat the O2S sensor must be tested to ensure that it is heating the sensor properly.
The O2S sensor circuit is monitored for a drop in voltage. The sensor output is used to test the heater by isolating the effect of the heater element on the O2S sensor output voltage from the other effects.
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Legend
Joined: Feb 2005
Posts: 8,058
Likes: 183
From: Fort Worth, TX
and like the dumbass I can be, I forgot that i unplugged an O2 to work on the trans last night....went to start it for the O2 heater reset...O2 open code. GRRRRRRRRR. I'm hoping it will self reset.