Help my 03 and me

[Ronald Meyers]

I've had this rager for about 7 years and I have never done anything to it finally just quit I'm a carpenter not a mechanic.
I read a lot and listened a lot and one year later I have it running but I still have some issues with some codes I need a little help my truck has a hundred and fifty-two thousand miles on it and I've just replaced the maf, the maps and the maps wire connector i hope is wired correctly and the idle air control, the PCV valve and I cleaned the hoses the PCV intake breather plate. The code readings I'm still getting are to lean bank 1 the po171 and I'm getting a p2195 O2 sensor stuck lean bank 1 sensor 1 I don't understand that and also cat system efficiency below threshold Bank 1 and the p1000 readiness test not complete so I don't know what those those are so anybody could help me out and I really appreciate it I didn't even know what sensors were until I tried working on this truck so now I respect everything about him and hopefully I'll learn more and keep it going for some time to come

 

[RonD]

Welcome to TRS

Well so far so good

You have a 4cyl 2.3l Duratec engine, good reliable engine, turbo version is in the new 2019/20 Rangers, just FYI

P1000 just means computer(PCM) was reset, memory cleared, not just codes cleared, either by you or by disconnecting battery for more than 10minutes or so
If PCM loses memory it has to re-test all the vehicles system, that can take a few days of driving, a few warmup and cool down cycles, so disregard for now

O2 sensors wear out, only sensor that does, recommended replacement is 100k miles but they can usually last 150k miles

They tend to go LEAN when they wear out, so your "stuck lean" may be because of the front O2 sensor(B1S1) being worn out
The "cat system efficiency below threshold" is from the rear O2 sensor(B1S2), the PCM compares the front O2 sensor and rear O2 sensor to "see" if the CAT converters are doing their job of cleanup the exhaust
So this code could be because front O2 sensor is not working as it should

I would change the front O2 sensor and then clear the codes to see if you still get the Lean codes and "cat system efficiency below threshold"
If Lean codes are gone but not the "cat system efficiency below threshold" then replace rear O2 sensor
Rears tend to last 300+K miles

An O2 sensor can "see" Oxygen once its warmed up above 650degF, which is why they are Heated O2 sensors
The PCM uses the front O2 sensor to see if its calculated air/fuel mix was correct

PCM wants to run the engine with 14.7 POUNDS of air to 1 POUND of gasoline, a 14.7/1 ratio, and its a weight ratio
PCM knows its running a 2.3 LITER engine, so it knows exactly how many LITERS of air is being sucked in at any RPM or throttle position
But it doesn't know the WEIGHT of that air, which is what the MAF sensor is for
Air weight changes ALOT by temperature and elevation above sea level, i.e. "hot air rises", because it lighter than cooler air
Gasoline weight says about the same all the time

So PCM does it calaculations then opens injectors to let in the exact amount/weight of gasoline for the air weight
Then it watches the Front O2 sensor for the "report"/feedback on oxygen level in the exhaust
Too much oxygen is a Lean burn
Too little oxygen is a Rich burn
Say it was a Lean Burn
PCM then opens injector longer to get correct oxygen level in exhaust, this is Short Term Fuel Trim(STFT)
+2 STFT means PCM is opening inject 2% longer than it calculated
-2 STFT means PCM is closing injector 2% sooner than it calculated

If PCM gets to over +15 STFT so 15% error in calculation it will set a Lean code, engine was never running Lean, PCM correcting is done in a few seconds

If the O2 sensor is wearing out your MPG will start to go down, because engine is running RICHER than it should because O2 sensor is failing


Lean codes are often because of AIR leaks in the intake/vacuum hoses, so PCMs calculations are incorrect because its starting data for amount of air is incorrect, this wouldn't effect MPG, as this is a reporting error

 

[Ronald Meyers]

Welcome to TRS

Well so far so good

You have a 4cyl 2.3l Duratec engine, good reliable engine, turbo version is in the new 2019/20 Rangers, just FYI

P1000 just means computer(PCM) was reset, memory cleared, not just codes cleared, either by you or by disconnecting battery for more than 10minutes or so
If PCM loses memory it has to re-test all the vehicles system, that can take a few days of driving, a few warmup and cool down cycles, so disregard for now

O2 sensors wear out, only sensor that does, recommended replacement is 100k miles but they can usually last 150k miles

They tend to go LEAN when they wear out, so your "stuck lean" may be because of the front O2 sensor(B1S1) being worn out
The "cat system efficiency below threshold" is from the rear O2 sensor(B1S2), the PCM compares the front O2 sensor and rear O2 sensor to "see" if the CAT converters are doing their job of cleanup the exhaust
So this code could be because front O2 sensor is not working as it should

I would change the front O2 sensor and then clear the codes to see if you still get the Lean codes and "cat system efficiency below threshold"
If Lean codes are gone but not the "cat system efficiency below threshold" then replace rear O2 sensor
Rears tend to last 300+K miles

An O2 sensor can "see" Oxygen once its warmed up above 650degF, which is why they are Heated O2 sensors
The PCM uses the front O2 sensor to see if its calculated air/fuel mix was correct

PCM wants to run the engine with 14.7 POUNDS of air to 1 POUND of gasoline, a 14.7/1 ratio, and its a weight ratio
PCM knows its running a 2.3 LITER engine, so it knows exactly how many LITERS of air is being sucked in at any RPM or throttle position
But it doesn't know the WEIGHT of that air, which is what the MAF sensor is for
Air weight changes ALOT by temperature and elevation above sea level, i.e. "hot air rises", because it lighter than cooler air
Gasoline weight says about the same all the time

So PCM does it calaculations then opens injectors to let in the exact amount/weight of gasoline for the air weight
Then it watches the Front O2 sensor for the "report"/feedback on oxygen level in the exhaust
Too much oxygen is a Lean burn
Too little oxygen is a Rich burn
Say it was a Lean Burn
PCM then opens injector longer to get correct oxygen level in exhaust, this is Short Term Fuel Trim(STFT)
+2 STFT means PCM is opening inject 2% longer than it calculated
-2 STFT means PCM is closing injector 2% sooner than it calculated

If PCM gets to over +15 STFT so 15% error in calculation it will set a Lean code, engine was never running Lean, PCM correcting is done in a few seconds

If the O2 sensor is wearing out your MPG will start to go down, because engine is running RICHER than it should because O2 sensor is failing


Lean codes are often because of AIR leaks in the intake/vacuum hoses, so PCMs calculations are incorrect because its starting data for amount of air is incorrect, this wouldn't effect MPG, as this is a reporting error
[/QUOTE

Welcome to TRS

Well so far so good

You have a 4cyl 2.3l Duratec engine, good reliable engine, turbo version is in the new 2019/20 Rangers, just FYI

P1000 just means computer(PCM) was reset, memory cleared, not just codes cleared, either by you or by disconnecting battery for more than 10minutes or so
If PCM loses memory it has to re-test all the vehicles system, that can take a few days of driving, a few warmup and cool down cycles, so disregard for now

O2 sensors wear out, only sensor that does, recommended replacement is 100k miles but they can usually last 150k miles

They tend to go LEAN when they wear out, so your "stuck lean" may be because of the front O2 sensor(B1S1) being worn out
The "cat system efficiency below threshold" is from the rear O2 sensor(B1S2), the PCM compares the front O2 sensor and rear O2 sensor to "see" if the CAT converters are doing their job of cleanup the exhaust
So this code could be because front O2 sensor is not working as it should

I would change the front O2 sensor and then clear the codes to see if you still get the Lean codes and "cat system efficiency below threshold"
If Lean codes are gone but not the "cat system efficiency below threshold" then replace rear O2 sensor
Rears tend to last 300+K miles

An O2 sensor can "see" Oxygen once its warmed up above 650degF, which is why they are Heated O2 sensors
The PCM uses the front O2 sensor to see if its calculated air/fuel mix was correct

PCM wants to run the engine with 14.7 POUNDS of air to 1 POUND of gasoline, a 14.7/1 ratio, and its a weight ratio
PCM knows its running a 2.3 LITER engine, so it knows exactly how many LITERS of air is being sucked in at any RPM or throttle position
But it doesn't know the WEIGHT of that air, which is what the MAF sensor is for
Air weight changes ALOT by temperature and elevation above sea level, i.e. "hot air rises", because it lighter than cooler air
Gasoline weight says about the same all the time

So PCM does it calaculations then opens injectors to let in the exact amount/weight of gasoline for the air weight
Then it watches the Front O2 sensor for the "report"/feedback on oxygen level in the exhaust
Too much oxygen is a Lean burn
Too little oxygen is a Rich burn
Say it was a Lean Burn
PCM then opens injector longer to get correct oxygen level in exhaust, this is Short Term Fuel Trim(STFT)
+2 STFT means PCM is opening inject 2% longer than it calculated
-2 STFT means PCM is closing injector 2% sooner than it calculated

If PCM gets to over +15 STFT so 15% error in calculation it will set a Lean code, engine was never running Lean, PCM correcting is done in a few seconds

If the O2 sensor is wearing out your MPG will start to go down, because engine is running RICHER than it should because O2 sensor is failing


Lean codes are often because of AIR leaks in the intake/vacuum hoses, so PCMs calculations are incorrect because its starting data for amount of air is incorrect, this wouldn't effect MPG, as this is a reporting error

RonD thanks a million,it was your comments and help to a member that I saw first on this site a few weeks ago similar to my questions that got me interested in becoming a member you are an inspiration and I appreciate you sharing your knowledge so I'm glad that you answered this because the last three weeks I've beenfamiliarizing myself with fuel trims in the censors India the OBD tool I haven't had no idea what I was doing until now feeling a lot more confident have a little more insight about it and I'm going to replace that sensor go from there , I live in mountains in a canyon on the South yuba River northern California and I have to drive 5 miles to get service so sometimes I'm not here and this worked out well I was looking at other things and the drive test and you answered so I really appreciate it and I'll let you know as soon as I get the sensor in and hopefully we'll have this engine running perfect again it's been a great truck and i know this is going to be a great forum I really appreciate you have a good weekend be safe, WOW I'm working on my truck now it's working well running again
Looking forward to my next post take care*
PS. I'm also digitally illiterate so it takes me a long time to do this stuff so just a heads up I'm laughing