SMOG CHECK TIME HCAT
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Junior Member
Joined: Dec 2013
Posts: 42
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E320 CDI
SMOG CHECK TIME HCAT
after failing the smog check for cat and evap, the smog guy said i just have to drive it, so i did.
i've also bought a scanner after driving for miles. cat and evap is fine. the hcat = heated catalyst shows up as n/a
from what i've read that most scanner with n/a is not applicable to the car i'm scanning...is that correct?
i've also bought a scanner after driving for miles. cat and evap is fine. the hcat = heated catalyst shows up as n/a
from what i've read that most scanner with n/a is not applicable to the car i'm scanning...is that correct?
MBWorld Fanatic!
Joined: May 2017
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C320
O2 sensor heater circuit. It's a resistive coil built into the O2 sensor designed to heat the sensor and bring it up to operation temperature faster. It can and does fail sometimes. The question is which of the 4 O2 sensors is bad. No way of knowing without codes and just driving it a bunch won't fix the problem.
Last edited by tjts1; Nov 24, 2019 at 08:07 AM.
Member
Joined: Apr 2019
Posts: 91
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From: Vermont, USA
01 clk430, 05 e500 4matic
No heated cat in your car, as indicated by the N/A listing. O2 sensors are heated, but if an o2 heater was burnt out you would get a check engine light quickly (simple resistance test). Any time you clear engine codes you also reset the "readiness" monitors. Drive it. Fastest way I've found to "ready" the monitors is to drive between 2000 and 2500 rpms at steady throttle position. Evap takes a longer time to ready because it does checks warm and cold. Not sure about your area, but here in Vt. you are allowed 1 monitor in a "not ready" condition
Last edited by scotterikson; Dec 1, 2019 at 03:05 AM.
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From: V E G A S
1922 Ford Model T / no OBD
You need to get CEL fixed and to start you have to read the codes and post the numbers here.
heated catalyst for me would be DEF fluid, but does your vehicle has it?
heated catalyst for me would be DEF fluid, but does your vehicle has it?
