2001 RX 300 , 3.288 v on bank 1 sensor 1 high voltage. Bank 2 .355

Asked by Feb 22, 2017 at 09:28 PM about the Lexus RX 300

Question type: Maintenance & Repair

P-1130 code changed bank 1air / fuel sensor for big bucks. Still high voltage

4 Answers


P1130 LEXUS - Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction Bank 1 Sensor 1...Possible causes; Faulty Air fuel Ratio (A/F) Bank 1, Sensor 1 Air fuel Ratio (A/F) Bank 1, Sensor 1 harness is open or shorted, Air fuel Ratio (A/F) Bank 1, Sensor 1 circuit poor electrical connection, Fuel pressure, Fuel injector Intake air leaks...The 1130 code is set when A/F sensor output voltage change value is not what the Engine Control Module (ECM) is expecting...The Air-Fuel ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. Based on the output voltage, the Engine Control Module (ECM) determines if the air-fuel ratio is RICH or LEAN and adjusts the stoichiometric air-fuel ratio. The ECM also checks the fuel injection volume compensation value to check if the A/F sensor is deteriorating or not. A/F sensor response deterioration is determined by the ratio of the A/F sensor output voltage variation and fuel trim variation.

Nice text book answer. 110,000 miles very easy miles really...no problems at all vehicle runs great , no history on t-belt or tune up I am looking for recommendations on procedures propane engine enhancement ? Compression test ? Tune up ?

Replaced sensor #1 short 0 volts, open 5 volts, fuel pressure ? Only on bank 1 ? . Both sensors are Varying . Scanner hooked up key on veh. not running bank 1 sensor 3.2 v . bank 2 sensor 0 .?


You realize the pulse would only go to the injector that needs to fire, or turn on...

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