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What makes a 1998 chevy cheyenne check engine light show code 0131

Answered by:Dan
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Customer Question

what makes a 1998 chevy cheyenne check engine light show code 0131

Country: United States
Make: Chevrolet
Model: cheyenne
Year: 1998
Engine: 5.7

Already Tried:
Changed spark plugs and wires rotor button distributor cap crank shaft sensor both bank 1 oxygen sensors ignition coil

Submitted: 574 days and 22 hours ago.

Category: Chevy

Value: $18

Status: CLOSED

Expert: Dan replied 574 days and 22 hours ago.

Welcome to JustAnswer, my name is XXXXX XXXXX X'm here to help get your problem resolved. Ask follow up questions, thanks. I've sean this often caused by a failing mass airflow sensor, clogged fuel filter, weak fuel pump, and oxygen sensor. Monitor fuel pressure and make sure that under a load or during the problem, fuel pressure is going over 60 PSi, check for vacuum leaks and clean maf with cleaner from parts store.

P0131 Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Low Voltage

Possible Causes

Setting Conditions

Check for air leaks in the exhaust manifold or in the exhaust pipes
Check for air leaks in the intake manifold and in related vacuum lines
Engine misfire condition present (look for P0300 series codes)
Fuel system too lean (possible low fuel pressure, water in fuel)
HO2S connector is damaged (check pins for damage, and for moisture)
HO2S signal circuit is shorted to ground
HO2S is damaged (i.e., cracked) or air reference hole clogged
PCM has failed

DTC P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P022, P0123, P0200, P0300, P0401, P0404, P0405, P0440, P0442, P0446, P0452, P0453, P1120, P1125, P1220, P1221, P1258, P1404, P1441, P1514, P1515, P1516, P1517 and P1518 not set; engine running in Closed Loop, fuel level over 10%, system voltage over 10v, TP angle from 8-50%, or on models with TAC, the APP sensor indicated angle from 3-70%, MAP signal more than 25 kPa, Intrusive and Scan Tool tests not enabled, then with the Lean Test enabled, the PCM detected the HO2S signal was less than 200 mv for 50 seconds; or during the P/E Mode test, the PCM detected the HO2S signal was less than 360 mv for 10 seconds.

This code sets in 2 Trip(s).
This code will turn on the MIL (Malfunction Indicator Lamp)

Customer replied 574 days and 22 hours ago.

how can i tell if it is the maf

Accepted Answer

Expert: Dan replied 574 days and 22 hours ago.

If it runs rough you can see if it runs better disconnected if so its probably dirty or bad, otherwise no easy way to test..But it usually sets other codes so I'd replace that if fuel pressure is good, no exhaust/vacuum leaks, injector cleaner doesnt help, and oxygen sensor doenst help.

Expert Type	Technician
Category:	Chevy
Pos. Feedback:	96.5 %
Accepts:	2628
Answered:	9/18/2011

Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database

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