honmusa:

apologies ,thanks for pointing out my error .it is the o2 socket I meant to say he should remove and confirmed immediately if the issue is due to a faulty o2 sensor but it seems the ops is another trail entirely of swapping what is not faulty.

No worries man we learn each day.
Op in clip it at the clip.just follow the wires frm the sensor upwards

I know more about Rx300.what i will surgest you do first is to ran a scan then get back to us.

stephcruse:
I know more about Rx300.what i will surgest you do first is to ran a scan then get back to us.

Thank you all for the suggestions. I really appreciate how helpful everyone has been. I ran the scan today and so many codes were found viz;
1. P0300
2. P0301
3. P0303
4. P0305
5. P0171
6. P0174
7. P0100
8. P0110
9. P0115
10. P0136
11. P0500
12. P1155
13. P0101

Im really scared on where to start on these issues. I will appreciate if any suggestions on how I will start repairing is offered to me on this thread so that i will relate it to my mechanic. Its a shame, most mechanic at Onitsha are still outdated. I really thank God for the advices i got from this thread so far. Any idea would be greatly appreciated. Thanks.

Etoo:

Thank you all for the suggestions. I really appreciate how helpful everyone has been. I ran the scan today and so many codes were found viz;
1. P0300
2. P0301
3. P0303
4. P0305
5. P0171
6. P0174
7. P0100
8. P0110
9. P0115
10. P0136
11. P0500
12. P1155
13. P0101

Im really scared on where to start on these issues. I will appreciate if any suggestions on how I will start repairing is offered to me on this thread so that i will relate it to my mechanic. Its a shame, most mechanic at Onitsha are still outdated. I really thank God for the advices i got from this thread so far. Any idea would be greatly appreciated. Thanks.

Wow E plenty, anyways we are watching football, when we finish we shall start with the most serious ones and narrow it down, no need to fear or be worried, it well.

erico2k2:

Wow E plenty, anyways we are watching football, when we finish we shall start with the most serious ones and narrow it down, no need to fear or be worried, it well.

Thanks man. Im becoming hopeful with ur encouragement. Thanks man

please clear, drive and rescan....some of the codes might have actually been stored while you were busy disconnecting and reconnecting during your trial and error thing...
p0171 and p0174....

Etoo:

Thank you all for the suggestions. I really appreciate how helpful everyone has been. I ran the scan today and so many codes were found viz;
1. P0300
2. P0301
3. P0303
4. P0305
5. P0171
6. P0174
7. P0100
8. P0110
9. P0115
10. P0136
11. P0500
12. P1155
13. P0101

Im really scared on where to start on these issues. I will appreciate if any suggestions on how I will start repairing is offered to me on this thread so that i will relate it to my mechanic. Its a shame, most mechanic at Onitsha are still outdated. I really thank God for the advices i got from this thread so far. Any idea would be greatly appreciated. Thanks.

Why are going back and fort on a simple issue .This thread is becoming unnecessarily long cos of not following the necessary procedure..Call my number @ signature and get a scanner .I am willing to give u a free remote support !!!!

Etoo:

Thank you all for the suggestions. I really appreciate how helpful everyone has been. I ran the scan today and so many codes were found viz;
1. P0300
2. P0301
3. P0303
4. P0305
5. P0171
6. P0174
7. P0100
8. P0110
9. P0115
10. P0136
11. P0500
12. P1155
13. P0101

Im really scared on where to start on these issues. I will appreciate if any suggestions on how I will start repairing is offered to me on this thread so that i will relate it to my mechanic. Its a shame, most mechanic at Onitsha are still outdated. I really thank God for the advices i got from this thread so far. Any idea would be greatly appreciated. Thanks.

Etoo, I'm a lexus technician, we also have a lexus forum on whatsapp and here on NL I didn't see this thread early enough I would had contributed. Hope these issues have been resolved, if not, call or whatsapp me on 07034581213.

Cheers!

Etoo:


Thanks man. Im becoming hopeful with ur encouragement. Thanks man

number 1-4 are same thing random misfire, check plugs and injectors. 301,303,305 means cylinder 1,3 and 5 respectively.

Number 5 &6 Code PO171- Lean mix of Bank 1 (passenger side of engine)
Code PO174- Lean mix of Bank 2 (driver's side of engine) Most of the time a P0171 and P0174 is caused by either a vacuum leak--more than likely the PCV hose and valve or a dirty or defective MassAirFlow sensor. Low fuel pressure can also cause this condition. The PCV hose is located on bank one but can affect both sides because the other end is located on the back of the upper intake manifold. Usually they deteriorate and get a hole in it.

PO100 Mass Air Flow (MAF) Circuit Malfunction

Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit.

PO500 Vehicle Speed Sensor Malfunction, I take it your speedometer is not working right?I had same problem got the speed sensor changed and speedometer started to work.

PO136 Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2).Hmm this has been covered enough on this section of NL I think its the last thing you check


P1155 TOYOTA - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1,Toyota specific code

erico2k2:
PO100 Mass Air Flow (MAF) Circuit Malfunction

Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit.

PO500 Vehicle Speed Sensor Malfunction, I take it your speedometer is not working right?I had same problem got the speed sensor changed and speedometer started to work.

PO136 Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2).Hmm this has been covered enough on this section of NL I think its the last thing you check


P1155 TOYOTA - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 2 Sensor 1,Toyota specific code

Thanks man. What of no. 9 thats P0155. Can that code also be the cause of the black smoke.

Etoo:

Thanks man. What of no. 9 thats P0155. Can that code also be the cause of the black smoke.

Could be it's same as your O2 sensor problem
Problem is ur car consumes way . much fuel. So check everything intake in your carpoint ur mechanic to this direction. Clean your Mass air flow sensor. Check for leaks. The O2 sensor should the third culprit. From your scan you there seems to be no serious problem except your pocket via fuel.

erico2k2:

Could be it's same as your O2 sensor problem
Problem is ur car consumes way . much fuel. So check everything intake in your carpoint ur mechanic to this direction. Clean your Mass air flow sensor. Check for leaks. The O2 sensor should the third culprit. From your scan you there seems to be no serious problem except your pocket via fuel.

Im sorry for the typo error, the no 9 says P0115. What could that be. Can it also contribute on the black smoke thing.

Etoo:

Im sorry for the typo error, the no 9 says P0115. What could that be. Can it also contribute on the black smoke thing.

That has nothing to do with your black smoke, its your Engine coolant temperature sensor,it needs changing, does your themometer in your car read accurate?
I asked youa question from b4 regarding your speedometer you never gave an answer

erico2k2:

That has nothing to do with your black smoke, its your Engine coolant temperature sensor,it needs changing, does your themometer in your car read accurate?
I asked youa question from b4 regarding your speedometer you never gave an answer

Im sorry my guy. The speedometer reads very fine. I ve cleared the code. Im using the car till i get up to 100km before i will rescan d car.

Etoo:

Im sorry my guy. The speedometer reads very fine. I ve cleared the code. Im using the car till i get up to 100km before i will rescan d car.

Ok cool

erico2k2:

Ok cool

After clearing the error and running more than 50km, there were only 2 codes p0171 and p0174. My mechanic checked for leaks but found none, changed a MAF sensor but the codes keep on throwing out. Any more idea.

Etoo:

After clearing the error and running more than 50km, there were only 2 codes p0171 and p0174. My mechanic checked for leaks but found none, changed a MAF sensor but the codes keep on throwing out. Any more idea.

did you say you changed teh O2 sensors?

Mullberry:
I could tell you fancy guess work in regard to serendipity than professional meticulous rectification. Whatever, any dead end futility will occur at your own expense.

Oga don't confuse the OP more with all this ur grammar .. Kilode take am easy now .. Wettun concern serendipity, futility,fatality and brutality with car wey dey commot black smoke ... Chaiii

tripoli007:


Oga don't confuse the OP more with all this ur grammar .. Kilode take am easy now .. Wettun concern serendipity, futility,fatality and brutality with car wey dey commot black smoke ... Chaiii

okay no say.

erico2k2:

did you say you changed teh O2 sensors?

No, the o2 sensors were not touched

Etoo:

No, the o2 sensors were not touched

Well you should check them as one of your codes refers to them

erico2k2:

Well you should check them as one of your codes refers to them

Today i rescanned the car after clearing the former code and got the following ;
P0171
P0174
P0136
My mechanic has checked for leakages, even removed out the manifold but there is no leakage. I ve changed the MAF SENSOR
THE BLACK SMOKE LINGERS ON ACCELERATION.

Can faulty O2 sensor cause the black smoke.

Etoo:

Today i rescanned the car after clearing the former code and got the following ;
P0171
P0174
P0136
My mechanic has checked for leakages, even removed out the manifold but there is no leakage. I ve changed the MAF SENSOR
THE BLACK SMOKE LINGERS ON ACCELERATION.

Can faulty O2 sensor cause the black smoke.

I thought this is the first thing I told u to check before u decided to start swaping MAF .

Etoo:

Today i rescanned the car after clearing the former code and got the following ;
P0171
P0174
P0136
My mechanic has checked for leakages, even removed out the manifold but there is no leakage. I ve changed the MAF SENSOR
THE BLACK SMOKE LINGERS ON ACCELERATION.

Can faulty O2 sensor cause the black smoke.

I thought this is the first thing I told u to check before u decided to start swaping MAF and prefer to complicate a simple procedure .

honmusa:

I thought this is the first thing I told u to check before u decided to start swaping MAF and prefer to complicate a simple procedure .

Yesterday i changed the downstream oxygen sensor. The black smoke has reduced but im still monitoring the change. I hope it solves it permanently. I will keep u updated. Thank you all for ur help so far.

Etoo:

Yesterday i changed the downstream oxygen sensor. The black smoke has reduced but im still monitoring the change. I hope it solves it permanently. I will keep u updated. Thank you all for ur help so far.

Downstream o2 sensor is a monitoring sensor not having anything to do with your suppose black smoke .
Is the upstream sensor that we are concerned with.Disconnect the Upstream sensor and immediately rev your car to to See if u are still getting black smoke ,very simple thing to do .This is not an issue of monitoring this for days ,u will see the result immediately.
Seems u are too like Kazeem system of swapping parts to resolve issue

honmusa:

Downstream o2 sensor is a monitoring sensor not having anything to do with your suppose black smoke .
Is the upstream sensor that we are concerned with.Disconnect the Upstream sensor and immediately rev your car to to See if u are still getting black smoke ,very simple thing to do .This is not an issue of monitoring this for days ,u will see the result immediately.
Seems u are too like Kazeem system of swapping parts to resolve issue

I did that earlier but that did not solve the issue. The black smoke was even Increased on doing that.

Get a brainbox that matches what you currently have and try it.
Almost sure this will solve your issue

Etoo:

I did that earlier but that did not solve the issue. The black smoke was even Increased on doing that.

Get a scanner that has data streaming capability and let resolve this issue once and for all .
call my number @ my signature ,I will take you try what do.

Etoo:

I did that earlier but that did not solve the issue. The black smoke was even Increased on doing that.

Get a scanner that has data streaming capability and let resolve this issue once and for all ,this issue has linger too long.
call my number @ my signature ,I will take you tru what do.

honmusa:

Get a scanner that has data streaming capability and let resolve this issue once and for all ,this issue has linger too long.
call my number @ my signature ,I will take you tru what do.

Ok, I think there is a need for me to order one from these online stores. i will call you once I have one.
thanks man.