P0420 Diagnostic Trouble Code Discussion for February 2020
Catalyst Efficiency Below Normal (Bank 1)
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| Help Request | Posted | |
| 1995 Lexus LS400 4.0L MIL Lamp on VIN: JT8UF22E7S P0420: catalytic converter efficiency below threshold B1. No drive ability problems but MIL comes on (especially while in Check Mode on Solus scanner). Scratching our heads when monitoring the voltage signal on the scanner is different than when measuring same voltage signal directly at the ECM connector with a v... |
February 03, 2020 | |
| 1995 Lexus LS400 4.0L MIL Lamp on VIN: JT8UF22E7S P0420: catalytic converter efficiency below threshold B1. No drive ability problems but MIL comes on (especially while in Check Mode on Solus scanner). Scratching our heads when monitoring the voltage signal on the scanner is different than when measuring same voltage signal directly at the ECM connector with a v... |
February 04, 2020 | |
| 2009 Acura MDX 3.7L No Start, no spark VIN: 2HNYD28669 P0420: bank 1 cat efficiency .420 code was in there before and customer was aware of it. Came in for a timing belt, which I've done dozens on V6 Hondas,no big deal ,battery was drained after t/b install, which I traced to hands free module,but no start still. No spark, weak spark,wont fire up now.Rechecked my work 3 times, timing is good.Cam a... |
February 13, 2020 |
