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This code means that the fuel is to lean. You have problem with your oxygen sensor in the bank 1 (location: exhaust manifold).
171 and the minum is 141
System to lean bank 1. Can be dirty MAF sensor or vacuum leak.
The country code and area code of Soligorsk, Belarus is 375, (8~0)171.
Possible Backboard service condition
The country code and area code of Ambala- Ambala, India is 91, (0)171.
Trouble code P0171 means: System too lean (Bank 1)
code 122
There is no telephone area code 171 in North America (USA, Canada, etc.). North American area codes cannot begin with 1. There is no longer a telephone area code 171 in the United Kingdom (+44 171 or 0171 in domestic format). That code was used for inner London from 1995 until 2000, when London was reunified under the single area code 020. Numbers that were in area code 0171 changed to 020 and added the digit '7' to the front of the local number to make the new 8-digit local number. Other countries may have a domestic telephone area code 171 or similar. Telephone country code +1 is North America, but you need the three-digit area code (i.e., one more digit) to narrow down the location. For example, +1 713 is Houston, Texas, but +1 714 is part of Orange County, California.
That 171 OBD code is for a "lean condition" (not enough fuel being added). This is a common false-ish alarm on Toyota Echos and results in the check engine light coming on and poor engine performance. It happened to me and a a few friends as well as many on the net (Google 171 and echo) In my case, I had poor fuel economy and poor power performance along with the check engine light. I took the car to the Toyota dealer and they charged me $90 to stick on a OBD reader to see code 171. They said the MAF needed to be replace for $130!!! I immediately checked online and found that the 171 problem was common to many post 2000 Toyota's and was due to dirt accumulation of the heater wires in a MAF (my guess is that the EGR gasses somehow contaminate it). The solution was to simply clean the MAF heater wires by spraying brake cleaner on them (To remove MAF you just need to remove an electrical connector and 2 Philip screws) The MAF is on the air tube in front of the air filter. To clean, spray in the "straw-like tube" from the bottom of the tube. (You can see the heater wires at the base of the tube with a flash light). Don't mix these two wires up with the temp sensor amber glob (which is very obvious to see).
80% of 171 = 80% * 171 = 0.8 * 171 = 136.8
33% of 171= 33% * 171= 0.33 * 171= 56.43