P0171 Diagnostic Trouble Code Discussion for December 2020
Fuel System Lean (Bank 1)
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| Help Request | Posted | |
| 2008 Toyota Corolla S 1.8L MIL Lamp on VIN: 1NXBR32E38 P0171: Lean exhaust B1. ... that sets code P0171 lean exhaust! Did smoke test engine cold, no leaks. The Long term trim was high (30.%) at idle or driving. After cleaning the MAF an throttle body and disconnect battery (rub cables together), The LT trim did drop to 22% even KOEO... |
December 02, 2020 | |
| 2007 Ford Mustang GT 4.6L Poor Idle Quality, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1ZVHT82HX7 P0171: Bk 1 lean. Here's one for the mustang enthusiasts. This will be a long post but there's a lot to say. Customer brought car in for failed emissions. After checking monitors the cat, O2 and O2 heater weren't ready. Mil lite was not on but I scanned computer and saw the... |
December 04, 2020 | |
| 2008 Toyota Corolla S 1.8L MIL Lamp on VIN: 1NXBR32E38 P0171: Lean exhaust B1. ... that sets code P0171 lean exhaust! Did smoke test engine cold, no leaks. The Long term trim was high (30.%) at idle or driving. After cleaning the MAF an throttle body and disconnect battery (rub cables together), The LT trim did drop to 22% even KOEO... |
December 04, 2020 | |
| 2014 Chevrolet Malibu LS 2.5L MIL Lamp on VIN: 1G11B5SL4E P0171: Fuel system lean bank 1. This vehicle has LT trim at [...]-40 at idle, ST trim seems to go back and forth around zero. Runs great, we are fairly stumped here as upstream O2 switches up and down through its full range, downstream hovers around .77V at idle. Both respond to forced v... |
December 11, 2020 | |
| 2007 Toyota Tacoma 4.0L MIL Lamp on VIN: 5TELU42N17 P0171: Fuel System Too Lean (Bank 1). ... please bear with me. Affected vehicle is a 2007 Toyota Tacoma with 4.0L. Have P0171 code that set intermittently. Checked for vacuum leaks, air fuel sensors, clogged air filter, cleaned MAF then swapped MAF with known good one. Checked Fuel pressure. ... |
December 11, 2020 |
