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lexpert, Lexus Master tech
Category: Lexus
Satisfied Customers: 2100
Experience:  Master Certified with lexus, 8 years experience with Lexus
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Poo57 Code With p300/p302, New B2S2 O2 Sensor. Live data

Customer Question

Poo57 Code With p300/p302, New B2S2 O2 Sensor. Live data Shows No Activity On Either Downstream, Both Have 12v, Suspect Either Juntion Box For EFI Relay Bad Or ECM, Harness Good
JA: Have you located all of the vehicle's oxygen sensors? Are the wires leading to and from each intact and in good shape?
Customer: Yes Harness Integrity Good
JA: What is the model/year of your Lexus?
Customer: 10 ES350
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Snap on Scanner Live Data shows "no activity" on b2s2 and b1s2 volts, DEAD on live data
JA: Anything else you want the mechanic to know before I connect you?
Customer: i suspect it may be the juction box With EFI Relay Is Bad, Only Other component is the ECM
Submitted: 6 months ago.
Category: Lexus
Expert:  Pete replied 6 months ago.

Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.

Is the engine running rough with this issue here?

Let me know so we can continue,thanks Pete