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Toyota Tacoma Diagnostic Codes and Warning Lights
My check engine light came on so I took my truck to the deal to find out why.
The diag codes that came back were: P0402 EGR and P0420 CAT.
The truck is running perfectly.
They are telling my that for the P0402 code I need a new EGR and EGR module, which with labor is about $400 - $500 to repair.
The other code will be much more expensive and with the EGR will probably cost about the same as the value of the truck. They are saying I need a new front convertor, rear convertor and an O2 sensor (O2 sensor was replaced 2-3 years ago). This will run about $2700.
I do not understand the CAT and EGR issues since the truck is running absolutely find; no abnormal exhaust smell.
Toyota tells me that a 3rd party exhaust service station can fix the CAT issue for probably a third of the cost with after market parts.
I've tuned up the truck (new plugs and air filter) hoping the problem is just poor airflow or a miss-firing plug. The engine light is out since Toyota ran the diag but if there is a real problem it will come back on.
Can anyone help me understand what these codes really mean or could also mean?
See also: What Your Check Engine Light Is Telling You
The diag codes that came back were: P0402 EGR and P0420 CAT.
The truck is running perfectly.
They are telling my that for the P0402 code I need a new EGR and EGR module, which with labor is about $400 - $500 to repair.
The other code will be much more expensive and with the EGR will probably cost about the same as the value of the truck. They are saying I need a new front convertor, rear convertor and an O2 sensor (O2 sensor was replaced 2-3 years ago). This will run about $2700.
I do not understand the CAT and EGR issues since the truck is running absolutely find; no abnormal exhaust smell.
Toyota tells me that a 3rd party exhaust service station can fix the CAT issue for probably a third of the cost with after market parts.
I've tuned up the truck (new plugs and air filter) hoping the problem is just poor airflow or a miss-firing plug. The engine light is out since Toyota ran the diag but if there is a real problem it will come back on.
Can anyone help me understand what these codes really mean or could also mean?
See also: What Your Check Engine Light Is Telling You
0
Comments
"With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor."
For the other code, read here.
Marcus
http://www.TacomaWorld.com/
I have a 2007 double cab tacoma and my maintenance required light came on. Since I did not have time, the light came on and I only chnaged the oil after one week. I just changed the oil and the light is still on.
I red the manual and says reset the ODOMETER.
If I reset it, is it going to stay to zero again?
Anymore ways of ressting it?
I have followed diagnostic instructions carefully and I am perplexed at the results. The diagnostic instructions from a Toyota website that I am following are:
"...Later models, '87 and newer use a multiple terminal "DIAGNOSTIC" connector which is a small, rectangular-shaped gray "box", usually located near the right fender in the engine compartment. To get codes out of this type of connector, jump the "TE1" and "E1" terminals. Finding these terminals is easy as the inside cover of the diagnostic connector contains a schematic of the connector pinouts..."
When I insert the jumper (paper clip) between TE1 and E1 then turn the ignition key to ON, the Check Engine light illuminates and stays constantly illuminated (e.g. the check engine lamp doesn't change intensity). I have waited over 3 minutes and there are no changes.
I have also disconnected and reconnected the jumper with the ignition switch remaining in the ON position. The results were exactly the same.
I have reset the ECU by disconnecting the battery and the check engine lamps stays out for about 15 minutes of driving, but then comes on again.
Does a steady Check Engine light have any meaning?
Can you provide any insight into what the problem might be?
Ken Lodge
Somewhere there is a leak in my evaporative syst.
How do I find the leak?
Randy
Code says improper flow through sonverter.
I had converters and sensors replaced, problem went away, and returned few months later.
Plugs, plug wires, converters, up and down stream sensors are all new. Light is back on.
When I had it reset, it came back on after about 100 miles.
I replaced battery and light came back on after about 1,000 miles.
Light is still on, truck runs perfect with no change in mileage or performance.
The code is always the same, converter flow.
I have inspection this month, any thoughts?