Check engine light comes code p1401 - 1998 Cadillac DeVille

Code 1401 is for a problem with the EGR temp sensor. The sensor and circuits would need to be checked.

Hi Abe, I'm glad to help!

P1401 is an EGR fault code: Differential Pressure Feedback EGR Circuit High Input. This can be caused by several things. EGR Valve is bad, Flow through the valve is restricted due to carbon build-up. Electrical connector OR wiring is damaged somewhere. Check the wiring and the connector at the EGR valve if no damage is found then replace the EGR valve and clean the port holes in the engine and the EGR tube that's running to the valve "IF IT HAS ONE". Clear the codes and drive it and see what happens. Hope this helps and have an awesome day Abe.

OBD2 fault codes have no cut and dry fix for every car that has it in memory. Here is the general info on the code. This code refers to the EGR valve back pressure sensor called the "DPFE" sensor
P1401 - DPFE Circuit High Input
Symptoms - Engine Light ON (or Service Engine Soon Warning Light) Possible causes

DPF EGR circuit open.

VREF short to PWR.

Damaged DPF EGR sensor.

DPFEGR circuit short to PWR.

SIG RTN circuit open.

Damaged PCM.

Possible solution A DPF EGR PID reading greater than 4.5 volts with the key ON and engine OFF or running indicates a hard fault.

P1401=

Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals, service bulletins, campaigns, illustrations and procedures, etc.

The P1401 means you EGR ,exhaust gases recirculation is partially blocked.You need to access it and clean it.

No, but check engine light mean emissions control system
fault. Have Honda deal with it because the have the proper
diagnostic equipment and parts to correct the problem. I
wouldn't use after market parts.

This is for the P1401
HE - Exhaust Gas Recirculation (EGR) Systems
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This is for teh P1131
H - Fuel Control
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After replacing the front pre cat/manifold assembly, if a new gasket was used on the flange where the precat mates to the exhaust pipe, make sure the bolts are tight and reset the engine codes with a scanner at a parts store. If the engine light comes on again with the same code you may have a faulty oxygen sensor.

Ford:DTC P1401 Differential Pressure Feedback EGR Circuit High Input
did you do the pin point testes? a fault code only tell s the sensor signal has a problem, that can be the actual sensor or the connector, or the wiring or the powertrain control module, with this sesor you can also hook the hoses up wrong and excessive exhaust back pressure can cause this as well.

00-30-001 2000 ACCENT DMTL DIAGNOSIS: DTC CODES P1401, P1402 AND P1403

p1402 - dm-tl air pump motor is shorted or disconnected.

2000 model year accent is equipped with a new enhanced evaporative emission system. this new system is capable of measuring leaks as small as 0.020" diameter. the new system pressurizesthe evaporative emission system with a diagnostic module for tank leakage (dm-tl), while the previous model's system appliedengine vacuum through the purge valve to detect system leaks.

service information
vehicles that have the check engine light illuminated and have dtc p1401, p1402 and p1403 stored in the ecm should have their electrical systems diagnosed related to the appropriate dtc. these codes are not related in any way to an evaporative emission system leak. the conditions that set the diagnostic codes areas follows:
p1401 - dm-tl air pump motor current draw is higher or lower than expected (normal = 17-36 ma).
p1402 - dm-tl air pump motor is shorted or disconnected.
p1403 - dm-tl changeover valve is shorted or disconnected